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': 'Methysergide is banned as it causes ? \nSelect and explain. \nA. Pulmonary fibrosis, B. Pleural effusion, C. Syncope, D. Myocarditis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Pulmonary fibrosis Methysergide It is chemically related to ergot alkaloids and antagonizes the action of serotonin on smooth muscles including that of blood vessels, withot producing ergot like effects. It is a potent 5HT2A/2C antagonist. It has been used for migraine prophylaxis, carcinoid and postgastrectomy dumping syndrome. Prolonged use has caused abdominal, pulmonary and endocardial fibrosis, because of which it has gone into disrepute.", 'role': 'assistant'}]