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 impoant stimulant for bile secretion is : \nSelect and explain. \nA. Cholecystokinin, B. Secretin, C. Bile acid, D. Bile salt', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Bile salt', 'role': 'assistant'}]