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 secretion is \nSelect and explain. \nA. Distension of stomach, B. Bile in duodenum, C. Protein in duodenum, D. Fatty food in duodenum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Protein / acid in\xa0duodenum is the most potent stimulus for secretion of secretin.', 'role': 'assistant'}]