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
[{'content': 'Adult non–pregnant female requires, calcium per day – \nSelect and explain. \nA. 400 mg, B. 600 mg, C. 800 mg, D. 1000 mg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]