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
Shoest peptide. is: 
Select and explain. 
A. Angiotensin-III, B. Vasopressin, C. Angiotensin-II, D. Angiotensin-I
A: Angiotensin-III
Answer: A: Angiotensin-III 
Explanation: Angiotensin-III