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': 'Intrinsic Factor of Castle is secreted by which of the following cells in gastric glands: \nSelect and explain. \nA. Chief cells, B. Parietal cells, C. Enterochromaffin cells, D. B cells', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Parietal cells', 'role': 'assistant'}]