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
All are premalignant oral lesions EXCEPT: 
Select and explain. 
A. Erythroplakia, B. Leukoplakia, C. Submucous fibrosis, D. Oral lichen planus
D: Oral lichen planus
Answer: D: Oral lichen planus 
Explanation: Ans d (Orallichen planus, Ref: Bailey & Love's short practice of surgery 25th edition page 735Pre malignant lesions of the oral mucosa present as either leucoplakia/ erythroplakia or speckled leucoplakia.Oral submucus fibrosis is a prema-lignant lesion with medium risk whereas oral lichen planus is a lesion with equivocal risk.Conditions associated with high riskErythroplakia Speckled erythroplakia Chronic hyperplastic candidiasisConditions associated with medium riskOral submucus fibrosis Syphilitic glossititis Sideropenic dysphagiaConditions associated with equivocal riskOral lichen planusDiscoid lupus erythematosousDiscoid keratosis congenital