This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'A newborn was diagnosed as having a congenital abnormality that resulted in transposition of great vessels. While preparing the infant for surgery, the medical team needed to keep the ductus arteriosus open. They did this by infusing : \nSelect and explain. \nA. Cortisol, B. Indomethacin, C. Alprostadil, D. Tacrolimus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]