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': 'Best prognosis is seen in - \nSelect and explain. \nA. Ca lip, B. Ca tongue, C. Ca palate, D. Ca floor of mouth', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Carcinoma of oral cavity \n\nMost common type of Carcinoma of oral cavity is squamous cell carcinoma\nIn the oral Cavity, tongue (30%) is the most common site followed by lip (17.4%) and the floor of mouth (16.4%)\nThe mortality from squamous Carcinoma also varies by site in the mouth, with the lowest mortality from lip Cancer and the highest for Cancer of the Tongue.', 'role': 'assistant'}]