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: Physiology
[{'content': 'Most important stimulant for bile secretion is \nSelect and explain. \nA. Cholecystokinin, B. Secretin, C. Bile acid, D. Bile salt', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Bile salts are the most important cholerectic or the substance that increases bile secretion. Cholecystokinin (CCK) is the most important cholagogue or substance that increases gallbladder contraction.', 'role': 'assistant'}]