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: Social & Preventive Medicine
Daily calcium requirement of infants is 
Select and explain. 
A. 300 mg, B. 500 mg, C. 600 mg, D. 1200 mg
B: 500 mg
Answer: B: 500 mg 
Explanation: None