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, which helps in absorption of Vit. B12 is produced by: 
Select and explain. 
A. Parietal cells of stomach, B. Chief cells of stomach, C. Beta cells of pancreas, D. Goblet cells
A: Parietal cells of stomach
Answer: A: Parietal cells of stomach 
Explanation: None