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': 'Daily dose of Fe for adolescent female is: \nSelect and explain. \nA. 1.8 mg/d, B. 2.4 mg/d, C. 3.4 mg/d, D. 4.0 mg/d', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 2.4 mg/d', 'role': 'assistant'}]