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': 'Which one is a contraindication to the use of ergot derivatives - \nSelect and explain. \nA. Migraine, B. Hyperprolactinemia, C. Obstructive vascular disease, D. Postpaum hemorrhage', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Obstructive vascular disease", 'role': 'assistant'}]