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 of the following adverse effects characteristically associated with methysergide ? \nSelect and explain. \nA. Pulmonary hypertension, B. Retroperitoneal fibrosis, C. Hepatotoxicity, D. Ischemic heart disease', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]