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': 'All of the following are secreted proenzyme form except : \nSelect and explain. \nA. Trypsin, B. Chymotrypsin, C. Pepsin, D. Ribonuclease', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Ribonuclease', 'role': 'assistant'}]