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
[{'content': 'Non-selective vasopressin receptor antagonist is \nSelect and explain. \nA. Tolvaptan, B. Conivaptan, C. Relcovaptan, D. Lixivaptan', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]