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
[{'content': 'Daily requirement of vitamin D in children is \nSelect and explain. \nA. 1 microgram, B. 2.5 microgram, C. 10 IU, D. 50-100 microgram', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vitamins.', 'role': 'assistant'}]