Chamavati, a 30 year old female from rural Assam with a history of chronic tobacco

Chamavati, a 30 year old female from rural Assam with a history of chronic tobacco chewing since 15 years of age, presents with difficulty in opening the mouth. On oral examination, no ulcer is seen. The diagnosis is


a) non-ulcerative carcinoma of buccal mucosa  
b) submucous oral fibrosis 
c)Temporomandibular joint arthritis


Ans (b)