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
New indication of tolvaptan as approved by FDA recently 
Select and explain. 
A. Phenylketonuria, B. Pancreatic tumours, C. Polycystic ovarian disease, D. Polycystic kidney disease
D: Polycystic kidney disease
Answer: D: Polycystic kidney disease 
Explanation: Tolvaptan is a vasopressin antagonist used for SIADH Now approved for PCKD Ref : HH Sharma 3rd ed.