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
Intrinsic Factor of Castle is secreted by which of the following cells in gastric glands: 
Select and explain. 
A. Chief cells, B. Parietal cells, C. Enterochromaffin cells, D. B cells
B: Parietal cells
Answer: B: Parietal cells 
Explanation: Parietal cells