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: Surgery
[{'content': 'All are premalignant conditions of the oral cavity except? \nSelect and explain. \nA. Chronic hyperplastic candidiasis, B. Oral submucosal Fibrosis, C. Snail track ulcer on tongue, D. Sideropenic dysphagia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Conditions Associated with Malignant Transformation High-risk Lesions Medium-risk Lesions Low-risk or Equivocal-risk Lesions Erythroplakia Speckled Erythroplakia Chronic hyperplastic candidiasis Oral submucous fibrosis Syphilitic glossitis Sideropenic dysphagia \\ (Paterson-Kelly syndrome) Oral lichen planus Discoid lupus erythematosus Discoid keratosis congenita Snail track ulcer on tongue: Seen in secondary syphilis , Benign in nature.', 'role': 'assistant'}]