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 level should be below \nSelect and explain. \nA. 300, B. 220, C. 200, D. 350', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]