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
Intrinsic factor secreted by 
Select and explain. 
A. Chief cells, B. Parietal / oxyntic cells, C. Antral cells, D. Mucous secreting cells
B: Parietal / oxyntic cells
Answer: B: Parietal / oxyntic cells 
Explanation: Parietal or oxyntic cells secrete HCl and intrinsic factor.Chief or zymogen or peptic cells secrete pepsinogen.(Ref: Ganong&;s Review of medical physiology, 23 rd edition, page 431)