This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Gain of function mutation in RAS gene is equal to loss of function mutation in \nSelect and explain. \nA. Rb, B. Bcr-tyrosine kinase, C. Bcl-2, D. GAP protein', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]