This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Neoplasia), Subject name: Surgery
[{'content': 'Which is not a premalignant condition? \nSelect and explain. \nA. Bowens disease, B. Leukoplakia, C. Acanthosisnigricans, D. Solar keratosis', 'role': 'user'}, {'content': "Answer: C \nExplanation: ANSWER: (C) Acanthosis nigricansREF: Das text book of surgery 3rd edition page 104Premalignant conditions of oral cavity:LeukoplakiaErythroplakiaChronic hyperplastic candidiasisOral sub mucosal fibrosisSyphillitic glossitisSideropenic dysphagiaPremalignant condition of squamous cell carcinoma of skin:Bowen's diseaseSenile keratosisXeroderma pigmentosaSolar/actinic keratosisLong standing chronic ulcerLupus vulgaris", 'role': 'assistant'}]