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
Non-selective vasopressin receptor antagonist is 
Select and explain. 
A. Tolvaptan, B. Conivaptan, C. Relcovaptan, D. Lixivaptan
B: Conivaptan
Answer: B: Conivaptan 
Explanation: Conivaptan is a non-selective vasopressin V1 and V2 antagonistTolvaptan, lixivaptan are selective V2 antagonists used in SIADH.Relcovaptan is a selective V1 antagonist.Ref: HL Sharma 3rd ed Pg 245