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 common site of melanoma on the orofacial skin is \nSelect and explain. \nA. Lower lip, B. Malar region, C. Forehead, D. Upper lip', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]