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 chief cells of the stomach secrete: \nSelect and explain. \nA. Intrinsic factor, B. Hydrochloric acid, C. Pepsinogen, D. Gastrin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. PepsinogenThe chief cells of the stomach secrete pepsinogen, and the parietal cells of the stomach secrete hydrochloric acid and intrinsic factor. Gastrin and CCK are secreted by specialized endocrine cells.', 'role': 'assistant'}]