Okay, let's tackle this question about Dewel's method of serial extraction. The user wants a detailed explanation for a medical MCQ. The question is about the second step in Dewel's procedure. First, I need to recall what the serial extraction procedure entails.

Dewel's method is part of orthodontic treatment, specifically for managing space in the primary dentition to accommodate permanent teeth. The process usually involves removing certain primary teeth to create space for the erupting permanent molars and incisors. The steps are sequential, so understanding the order is key.

The core concept here is the sequence of steps in Dewel's method. The second step typically involves extracting the primary molars after the initial step of extracting the primary canines. I should confirm that the second step is indeed the extraction of primary molars. Other steps might include monitoring and later extraction of other teeth, but the second step is critical here.

Now, the correct answer would be the extraction of primary molars. The options are not provided, but based on standard knowledge, the second step follows the extraction of canines. The other options might involve incorrect steps like extracting incisors or premolars, which aren't part of the procedure in the second step. I need to explain why each incorrect option is wrong, perhaps because they refer to different steps or unrelated procedures.

Clinical pearl: Remembering the sequence of Dewel's method as C-M-P (canine, molar, primary incisors) could help. High-yield fact is that the second step is always the primary molars. Need to structure the explanation clearly, following the user's formatting rules, and ensure that each section is concise and meets the character limit.

**Core Concept**
Dewel's serial extraction is an orthodontic procedure to create space for erupting permanent teeth in patients with **Class I malocclusion and space deficiency**. The protocol follows a specific sequence: **primary canine extraction first**, followed by **primary molar extraction**, and finally **permanent incisor extraction** if needed. This step-by-step approach prevents space loss and guides proper alignment.

**Why the Correct Answer is Right**
The **second step** in Dewel’s method involves **extracting the primary molars** (typically the first and second primary molars) after the primary canines. This creates space for the erupting permanent first molars and facilitates spontaneous alignment of permanent incisors. The procedure relies on the mesial drift of molars and the labial eruption of incisors to correct crowding.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect. Extracting permanent teeth (e.g., incisors) occurs later, not second.
**Option B:** Incorrect. Extracting primary canines is the **first step**, not the second.
**Option C:** Incorrect. Extracting primary incisors is **not part** of Dewel’s method.
**Option D:** Incorrect. Monitoring without extraction does not align with the active serial extraction protocol.

**Clinical Pearl / High-Yield Fact**
Memorize the **C-M-P sequence**: **C**anine (primary), **M**olar (primary), **P**ermanent incisor. Confusion often arises with other extraction protocols (e.g., Nance’s method for Class II), so focus on the **order** specific to Dewel’s method for Class I cases

✓ Correct Answer: C. Extract first deciduous molar only