This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: RDA, Nutritional Requirements, Subject name: Social & Preventive Medicine
[{'content': 'Daily Calcium requirement of infants is:- \nSelect and explain. \nA. 300 mg, B. 500 mg, C. 600 mg, D. 1200 mg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Calcium requirement:- Man - 600 mg/day Woman - 600 mg/day Pregnancy - 1200 mg/day Lactation - 1200 mg/day Infants - 500 mg/day.', 'role': 'assistant'}]