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: ENT
[{'content': 'Which Ca has best prognosis: \nSelect and explain. \nA. Carcinoma lip, B. Carcinoma cheek, C. Carcinoma tongue, D. Carcinoma palate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Oral malignancy with best prognosis is carcinoma lips. Oral cancer with worst prognosis is floor of mouth carcinoma.', 'role': 'assistant'}]