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': 'Dose of chioroquine at 4-8 year - \nSelect and explain. \nA. 300 mg., B. 150 mg., C. 450mg, D. 600 mg.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]