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': 'Drug of choice for intraoperative right hea failure due to pulmonary hypeension \nSelect and explain. \nA. Dopamine, B. Isoprenaline, C. Milrinone, D. Halothane', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]