**Core Concept**
The question is testing knowledge of dermatological conditions characterized by specific types of skin eruptions. **Vesicular eruptions** are a key feature of several dermatological conditions, and identifying the specific characteristics of these eruptions is crucial for diagnosis.

**Why the Correct Answer is Right**
Although the correct answer is not specified, a "sago grain like vesicular eruption" is typically associated with **scabies**, a parasitic infection caused by the mite Sarcoptes scabiei. The eruption is due to the burrowing of the mite into the upper layer of the skin, leading to intense itching and a characteristic rash.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option provided, it's challenging to give a precise reason for its incorrectness.
**Option B:** Similarly, without the option, the reason for its incorrectness cannot be stated.
**Option C:** This option would be incorrect if it does not align with the clinical presentation of scabies or another condition known for a sago grain like appearance.
**Option D:** This option would also be incorrect if it does not match the known dermatological conditions characterized by such an eruption.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that scabies is highly contagious and can spread through direct skin-to-skin contact. The diagnosis is often clinical, based on the appearance of the rash and the presence of severe itching, especially at night.

**Correct Answer:** D. Scabies.