## **Core Concept**
The World Health Organization (WHO) recommends vitamin A supplementation for children to prevent vitamin A deficiency, which can lead to night blindness, weakened immune systems, and increased mortality. The recommended dosage varies by age and is crucial for public health programs.

## **Why the Correct Answer is Right**
The correct dose for children aged 1-6 years is **200,000 IU**. This recommendation is based on the WHO guidelines for vitamin A supplementation, which aim to provide a sufficient amount of vitamin A to prevent deficiency without causing toxicity. The dosage is adjusted according to age because the requirements and risks of toxicity vary.

## **Why Each Wrong Option is Incorrect**
- **Option A:** 100,000 IU - This dose is actually recommended for children under 1 year of age, not for those aged 1-6 years.
- **Option B:** 500,000 IU - This is too high for a routine supplement dose for children aged 1-6 years and could increase the risk of toxicity.
- **Option D:** 1,00,000 IU - This option seems to be a repetition or misprint and is lower than the recommended dose for children aged 1-6 years.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that vitamin A supplementation is a critical public health intervention, especially in areas where vitamin A deficiency is common. The dosing schedule is as follows: 50,000 IU for infants 6-11 months, 100,000 IU for children 1-6 years, repeated every 6 months.

## **Correct Answer:** . 200,000 IU.