This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'New indication of tolvaptan as approved by FDA recently \nSelect and explain. \nA. Phenylketonuria, B. Pancreatic tumours, C. Polycystic ovarian disease, D. Polycystic kidney disease', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Tolvaptan is a vasopressin antagonist used for SIADH Now approved for PCKD Ref : HH Sharma 3rd ed.', 'role': 'assistant'}]