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
The intrinsic factor of Castle is secreted by 
Select and explain. 
A. Chief cells, B. Parietal cells, C. Enterochromaffin like cells, D. G-cells
B: Parietal cells
Answer: B: Parietal cells 
Explanation: Parietal cells secrete hydrochloric acid and intrinsic factor, and chief cells produce pepsinogens and gastric lipase. Enterochromaffin-like cells secrete Histamine. G cells secrete gastrin hormone. Reference: Ganong's review of Medical Physiology, 25th ed, Page: 458