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: Unknown
[{'content': 'Tumour suppressor gene - \nSelect and explain. \nA. k- RAS gene, B. Rb gene, C. FOS gene, D. MYC gene', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Rb gene", 'role': 'assistant'}]