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: Pharmacology
[{'content': 'The most potent drugs to reduce plasma cholesterol level are: \nSelect and explain. \nA. Plant sterols, B. Fibrates, C. Anion exchange resins, D. Statins', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]