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': 'HCI is secreted by which cells of stomach ? \nSelect and explain. \nA. D-cells, B. Zymogen cells, C. Chief cells, D. Oxyntic cells', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Oxyntic cells", 'role': 'assistant'}]