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 carcinoma of the thyroid is associated with which of the following syndrome - \nSelect and explain. \nA. MEN I, B. MEN II, C. Fraumeni syndrome, D. Hashimoto's thyroiditis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]