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': 'A 40 year old tobacco chewer was given a routine oral examination; on examination non-scrapable white patch was noticed in his left buccal mucosa.\n\nProvisional diagnosis for the white Lesion will be \nSelect and explain. \nA. Lichen planus, B. Erythroplakia, C. Leukoptakia, D. Submucous fibrosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]