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': 'The only FDA approved therapeutic use of Endothelium-Derived Relaxing Factor is \nSelect and explain. \nA. Pulmonary hypeension in newborn, B. Primary pulmonary hypeension, C. Congestive cardiac failure, D. Essential hypeension in newborn', 'role': 'user'}, {'content': 'Answer: A \nExplanation: EDRF is also called nitric oxide. The only approved use is vasodilatation in Pulm.HTN in newborn Ref: Goodman Gillman 12thedPg 1059', 'role': 'assistant'}]