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': 'Oral melonomas are much more aggressive than skin melanoma as it starts with: \nSelect and explain. \nA. Stage 2, B. Stage 3, C. Stage 4, D. Stage 5', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]