This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Pharmacology
Desmopressin is a synthetic analog of ADH. It is preferred over arginine vasopressin in the treatment of diabetes insipidus for all of the following reasons EXCEPT: 
Select and explain. 
A. It is a more potent antidiuretic, B. It is a selective vasopressin V1 receptor agonist, C. It has a little vasoconstrictor activity, D. It is longer acting
B: It is a selective vasopressin V1 receptor agonist
Answer: B: It is a selective vasopressin V1 receptor agonist 
Explanation: Vasopressin can act on V1 and V2 receptors whereas desmopressin is a selective V2 receptor agonist. Desmopressin: It is a more potent antidiuretic It is longer acting It has a little vasoconstrictor activity