This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
Malnourished children are at risk for complications of measles, leading to greater morbidity and mortality. Which of the following should be given to children to reduce these risks? 
Select and explain. 
A. Vitamin A, B. Vitamin B, C. Vitamin C, D. Vitamin D
A: Vitamin A
Answer: A: Vitamin A 
Explanation: High-dose vitamin A (a) given to malnourished children and anyone with vitamin A deficiency reduces the risk of mortality. The World Health Organization recommends that all children with measles receive vitamin A supplementation (not necessarily high-dose). The remaining vitamins listed do not have any effects on the outcome of measles.