This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'Cholesterol level for prevention of coronary aery disease- \nSelect and explain. \nA. < 250 mg\\/dl, B. < 220 mg\\/dl, C. < 300 mg\\/dl, D. < 200 mg\\/dl', 'role': 'user'}, {'content': 'Answer: D \nExplanation: to prevent CAD the cholesterol levels must be below 200 mg per dl', 'role': 'assistant'}]