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 of castle is present in: 
Select and explain. 
A. Chief cells, B. Fundus cells, C. Goblet cells, D. Parietal cells
D: Parietal cells
Answer: D: Parietal cells 
Explanation: Ans. D. Parietal cellsIntrinsic factor of castle which is also called as IF is secreted by Parietal cells in the antrum of stomach. Main stimulus is gastrin