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
Which of the following is octapeptide 
Select and explain. 
A. Glutathione, B. Angiotensin I, C. Angiotensin II, D. Oxytocin
C: Angiotensin II
Answer: C: Angiotensin II 
Explanation: Glutathione is tripeptide
Angiotensin I is decapeptide
Oxytocin and Vasopressin are nonapeptide.