<prompt> Which of the following is not a premalignant condition oral cancer-LeukoplakiaErythroplakiaOral submucous fibrosisSystemic Sclerosis  <response>: Ans. is d i.e., Systemic Sclerosis Lesions with increased risk of malignancy in oral cancero Premalignant condition:- Leukoplakia, Erythroplakia, Speckled erythroplakia, chronic hyperplastic candidiasiso Conditions increasing risk:- Oral submucous fibrosis, syphilitic glossitis, sideropenic dysphagia Peterson Kelly syndrome.o Risk is doubtful:- Oral lichen planus, DLE, Dyskeratosis congenita. 