This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral Cavity, Subject name: ENT
[{'content': 'The most common pre-malignant condition of oral carcinoma is: \nSelect and explain. \nA. Leukoplakia, B. Erythroplakia, C. Lichen planus, D. Submucous Fibrosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (a) Leukoplakia(Ref. Cummings, 6th ed., 1299)All the other choices also are pre-malignant but leukoplakia is the most common premalignant condition.', 'role': 'assistant'}]