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': 'The best example of a proto-oncogene activated by point mutation is - \nSelect and explain. \nA. Ras, B. N-myc, C. L-myc, D. Abl', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]