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': 'Ideal cholesterol should be below \nSelect and explain. \nA. 100mg /dL, B. 200mg / dL, C. 150 mg / dL, D. 250 mg / dL', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]