All are non scrapable white lesions, except:: (A) Leukoplakia, (B) Lichen planus, (C) Chemical burns, (D) White sponge nevus
Answer is C. Non-Scrapable White Lesions

Leukoplakia  
Lichen planus 
Linea alba
Frictional hyperkeratosis  
White sponge nevus  
Dyskeratosis congenita
Chronic hyperplastic candidiasis.