<prompt> A 85 year old woman with Nikolsky signve, blisters on thigh trunk, lesions come on off. What is the causePemphigus vulgarisPemphigoidLichen planusDermatitis herpetiformis  <response>: In this question :-Age 85 yearBlisters on lower body thigh trunkNikolskys sign negativeAmongst the given options only pemphigoid bullous pemphigoid full fills these criteria. 