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': 'Ergot alkaloid commonly used to prevent postpartum hemorrhage is : \nSelect and explain. \nA. Methylergometrine, B. Ergotamine, C. Dihydroergotamine, D. Dihydroergotoxine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Methylergometrine (methergine) is administered during delivery of anterior shoulder to prevent postpartum hemorrhage.', 'role': 'assistant'}]