**Core Concept**
The recommended oral dose of vitamin A is crucial in preventing and treating vitamin A deficiency, particularly in children. The World Health Organization (WHO) guidelines provide specific dosing recommendations to ensure effective supplementation.

**Why the Correct Answer is Right**
The correct answer is based on the WHO guidelines for vitamin A supplementation in children. For children aged 6-11 months, the recommended dose is 100,000 IU on each of days 1, 2, and 28. This high dose is necessary to rapidly restore vitamin A levels and prevent complications such as night blindness, xerophthalmia, and increased risk of infections.

**Why Each Wrong Option is Incorrect**
* **Option A:**
This dose is too low for children aged 6-11 months and would not provide adequate vitamin A supplementation.
* **Option B:**
This dose is not recommended for children of this age group and could lead to toxicity.
* **Option C:**
This dose is also not recommended and could result in adverse effects due to excessive vitamin A intake.

**Clinical Pearl / High-Yield Fact**
Remember that vitamin A supplementation should only be given under the guidance of a healthcare professional, and the correct dose must be administered according to the child's age and weight.

**Correct Answer: C. 50,000 IU.**