This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Physiology
[{'content': 'The most important cholorectic is: \nSelect and explain. \nA. Bile salt, B. CCK, C. Secretin, D. Gastrin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Bile salta. Cholagogue is the one which causes gall bladder contraction, thereby increasing flow (eg CCK - PZ)b. Choleretic increases secretion of bile (eg- Bile salt)', 'role': 'assistant'}]