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: Medicine
[{'content': 'Which of the following is common risk factor for coronary heart disease except ? \nSelect and explain. \nA. Family H/O of IHD, B. Decreased homoscystinaemia, C. HDL <40 mg/dL, D. Type 1 DM', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]