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': 'In MEN syndromes 2A and 2B, which growth factor receptor shows point mutation? \nSelect and explain. \nA. TP53, B. RET, C. KIT, D. MSH 2', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]