This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Daily requirement of vitamin D in children is 
Select and explain. 
A. 1 microgram, B. 2.5 microgram, C. 10 IU, D. 50-100 microgram
A: 1 microgram
Answer: A: 1 microgram 
Explanation: Vitamins.