**Core Concept**
Vitamin A is an essential nutrient for growth, development, and immune function, especially in children. The recommended dietary allowance (RDA) for Vitamin A varies based on age, weight, and other factors to prevent deficiency and toxicity.

**Why the Correct Answer is Right**
For children between 1-3 years, the World Health Organization (WHO) recommends a daily dose of 200,000 IU (International Units) of Vitamin A given in two doses separated by 24 hours, as part of mass treatment programs or for severe acute malnutrition. This dose is higher than the RDA to rapidly replenish body stores and prevent deficiency-related complications.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct dosage or frequency of administration for children in this age group.
**Option B:** This option may be a distractor with a plausible-sounding dose, but it lacks the essential detail of the recommended administration schedule.
**Option C:** This option may be too low to effectively replenish Vitamin A stores in children with deficiency or malnutrition.

**Clinical Pearl / High-Yield Fact**
When administering Vitamin A supplements to children, it is crucial to follow the recommended dosing schedule to avoid toxicity, which can cause symptoms such as headaches, dizziness, and even liver damage.

**Correct Answer:** D. 200,000 IU given in two doses 24 hours apart.