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': 'Folic acid supplementation during lactation period is \nSelect and explain. \nA. 150 mg/d, B. 100 mg/d, C. 400 mg/d, D. 450 mg/d', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]