## Core Concept
The treatment of Vitamin A deficiency, particularly in cases of deficiency-related conditions such as night blindness or more severe forms like xerophthalmia, involves administering Vitamin A supplements. The World Health Organization (WHO) provides guidelines for the treatment, which includes the number of doses and the dosage interval.

## Why the Correct Answer is Right
The WHO recommends a treatment regimen for Vitamin A deficiency that typically involves immediate administration of Vitamin A and follow-up doses. For children with Vitamin A deficiency, the recommended treatment is to administer 200,000 IU (International Units) for children over 1 year of age and 100,000 IU for children under 1 year of age, immediately, and then repeated the next day and again after 2 weeks (or at least 2 doses, sometimes a third dose is recommended). Therefore, the correct number of doses often cited is **3 doses** over a period, reflecting an immediate dose and two follow-up doses.

## Why Each Wrong Option is Incorrect
- **Option A:** This option suggests a single dose, which is insufficient for complete treatment as multiple doses are required for adequate replenishment of Vitamin A stores.
- **Option B:** This option might suggest a lower number of doses than required for comprehensive treatment.
- **Option D:** This option suggests more doses than typically recommended for initial treatment.

## Clinical Pearl / High-Yield Fact
A key point to remember is that Vitamin A deficiency treatment involves immediate and follow-up doses, typically **3 doses** over 2 weeks, according to the WHO guidelines. This treatment aims to rapidly replenish Vitamin A stores and prevent progression of deficiency-related complications.

## Correct Answer: C.