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
[{'content': 'Pepsinogen is activated by ? \nSelect and explain. \nA. Enterokinase, B. Enteropeptidase, C. H+, D. Trypsin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is c i.e.,H+ Pepsin is secreted by chief cells of stomach in an inactive (zymogen) form called pepsinogen. Acid (IF) in lumen of stomach conves pepsinogen to active pepsin. Pepsin once formed also attacks pepsinogen producing more pepsin molecules by autocatalysis.', 'role': 'assistant'}]