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: Biochemistry
[{'content': 'Which of the following is octapeptide \nSelect and explain. \nA. Glutathione, B. Angiotensin I, C. Angiotensin II, D. Oxytocin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Glutathione is tripeptide\nAngiotensin I is decapeptide\nOxytocin and Vasopressin are nonapeptide.', 'role': 'assistant'}]