A 24 years old (middle aged) female has flaccid bullae in the skin and persistent painful oral erosions (palatal & vestibular lesions in buccal mucosa). Histopathology shows intraepidermal acantholytic blister. The most likely diagnosis is: (A) Bullous Pemphigoid., (B) Erythema multiforme, (C) Pemphigus vulgaris., (D) Dermatitis herpetiformis.
Answer is C. C i.e. Pemphigus vulgaris