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
Which is not a premalignant condition? 
Select and explain. 
A. Bowens disease, B. Leukoplakia, C. Acanthosisnigricans, D. Solar keratosis
C: Acanthosisnigricans
Answer: C: Acanthosisnigricans 
Explanation: 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