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: Surgery
[{'content': 'The commonest pre-malignant condition of oral cancer is - \nSelect and explain. \nA. Leukoplakia, B. Aphthous ulcer, C. Lichen planus, D. Erythro-leukoplakia', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Leukoplakia Leukoplakia is the most common (-85%) of the premalignant lesions of the oral cavity.", 'role': 'assistant'}]