This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hallmarks of Cancer, Subject name: Pathology
[{'content': 'Gene associated with medullary carcinoma of thyroid is? \nSelect and explain. \nA. RAS, B. RET, C. p53, D. MET', 'role': 'user'}, {'content': "Answer: B \nExplanation: ANSWER: (B) RETREF: Schwartz's Principles of Surgery 9th edition chapter 38, Sabiston 18th ed chapter 36", 'role': 'assistant'}]