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 among the following is the shoest peptide? \nSelect and explain. \nA. Angiotensin-III, B. Vasopressin, C. Angiotensin-II, D. Angiotensin-I', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Angiotensinogen is a 452-amino-acid-long protein, which is produced by the liver. Angiotensin I, comprising the first 10 amino acids of angiotensinogen, is produced by cleavage of a leucine-valine bond by renin. The 10-amino-acid angiotensin I is completely inactive but is subsequently conveed to the eight-amino-acid peptide hormone, angiotensin II. This reaction is catalyzed by angiotensin-conveing enzyme (ACE). Angiotensin II can also be conveed to a seven-amino-acid angiotensin III. Vasopressin or AVP is a nonapeptide. Ref: Lorenzo A.J. (2012). Chapter 18. The Urinary System. In L.W. Janson, M.E. Tischler (Eds), The Big Picture: Medical Biochemistry.', 'role': 'assistant'}]