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 potent stimulus for secretin is - \nSelect and explain. \nA. Dilatation of intestine, B. Acid chime, C. Protein, D. Fat', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Acid chyme', 'role': 'assistant'}]