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 most common malignancy of the oral cavity is: \nSelect and explain. \nA. Basal cell carcinoma, B. Transitional cell carcinoma, C. Melanoma, D. Squamous cell carcinoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]