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': 'Mechanism of action of cholestyramine is ? \nSelect and explain. \nA. Bind to bile acid, B. Decrease HMG-COA, C. Increase excretion of cholesterol, D. Decrease utilization of cholesterol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., Bind to bile acid "Chlestyramine is a bile acid sequesterant"', 'role': 'assistant'}]