**Question:** Most common salivary gland involved by stone is

A. Submandibular
B. Parotid
C. Salivary duct
D. Sublingual

**Core Concept:** Salivary glands are three pairs of exocrine glands located in the head and neck region, responsible for producing saliva, which plays a crucial role in digestion and maintaining oral health. Salivary stones, also known as sialoliths, are formed when salivary substances crystallize and accumulate within the salivary glands or ducts, resulting in obstruction and potential complications.

**Why the Correct Answer is Right:** The most common salivary gland involved by stones is the **parotid gland**. The parotid gland is the largest salivary gland, located superficially in the cheek, and is more prone to stone formation due to its large duct and high concentration of calcium salts in its saliva.

**Why Each Wrong Option is Incorrect:**

**Option A (Submandibular gland)**: Although stones can occur in the submandibular gland, it is less common compared to the parotid gland due to its deeper location and narrower duct.

**Option B (Sublingual gland)**: Although stones can occur in the sublingual gland, they are even less common than submandibular gland stones due to its smaller size, deeper location, and narrow duct.

**Option C (Salivary duct)**: Salivary duct stones are less common than glandular stones. Salivary duct stones occur when stones form within the ducts that transport saliva to the mouth, such as the major salivary ducts (parotid, submandibular, and sublingual).

**Correct Answer Explanation**: Submandibular gland stones (Option A) are not the most common, but they can still occur. The **parotid gland (Option B)** is the most commonly affected due to its larger size, superficial location, and broader duct, which increases the chances of stone formation.

**Clinical Pearls**: Recognizing salivary stones is important because they can lead to local inflammation (sialadenitis), obstructive symptoms (e.g., pain, swelling), and potentially even systemic complications (e.g., sepsis). Early diagnosis and treatment are crucial to prevent complications.