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
HCI is secreted by which cells of stomach ? 
Select and explain. 
A. D-cells, B. Zymogen cells, C. Chief cells, D. Oxyntic cells
D: Oxyntic cells
Answer: D: Oxyntic cells 
Explanation: Ans. is 'd' i.e., Oxyntic cells