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': 'An Example of a tumour suppressor gene is: \nSelect and explain. \nA. myc, B. fos, C. ras, D. RB', 'role': 'user'}, {'content': 'Answer: D \nExplanation: RB', 'role': 'assistant'}]