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': 'Most potent stimulus for secretin \nSelect and explain. \nA. Acid chyme, B. Dilation of intestine, C. Fat, D. Protein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Acidic chyme is the most potent stimulus for secretin Ref: guyton and hall textbook of medical physiology 12 edition page number:416,417,418', 'role': 'assistant'}]