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': 'Carcinoma of the cheek: \nSelect and explain. \nA. Characteristically is columnar-celled., B. Has a recognized association with chewing gum, C. Has a recognized association with chewing betel nut, D. Has a recognized association with geographic tongue', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]