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': 'Which of the following is the most important stimulus for the secretion of bile: \nSelect and explain. \nA. Bile salts, B. Bile acid, C. Secretin, D. CCK', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Bile saltsCholagoguesCholereticsSubstances that cause contraction of gall bladder (CCK)Substances that increase the secretion of bile (bile salts are most potent)', 'role': 'assistant'}]