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': 'BRAF acts as main proto-oncogene in? \nSelect and explain. \nA. Hairy cell leukemia, B. Langerhans cell histiocytosis, C. Melanoma, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]