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: Pathology
[{'content': 'Medullary thyroid carcinoma is associated with? \nSelect and explain. \nA. MEN I, B. MEN II, C. MEN III, D. MEN IV', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., MEN II About 70% of tumors arise sporadically. The remainder occurs in the rsetting of MEN syndrome 2A or 2B or as familial tumors without an associated MEN syndrome (familial medullary thyroid carcinoma, or FMTC.", 'role': 'assistant'}]