This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral cavity & Oesophagus, Subject name: ENT
[{'content': 'Which of the following is not a premalignant condition oral cancer? \nSelect and explain. \nA. Leukoplakia, B. Erythroplakia, C. Oral submucous fibrosis, D. Systemic Sclerosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Lesions with an increased risk of malignancy on oral cancerPremalignant condition:- Leukoplakia, Erythroplakia, speckled erythroplakia, chronic hyperplastic candidiasisConditions increasing risk:- Oral submucous fibrosis, syphilitics glossitis, sideropenic dysphagia (Peterson Kelly syndrome)The risk is doubtful:- Oral lichen planus, DLE, Dyskeratosis congenital.Ref: PL Dhingra, Diseases of Ear, Nose & Throat, 7th edition, pg no. 253', 'role': 'assistant'}]