This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vesiculobullous (Blistering) Disorders, Subject name: Skin
[{'content': 'A 45-year-old female came with complaints of blisters over her body followed by rupture of it and severe skin pain, it begins in the mouth. There is peeling of skin on applying pressure. The dermatologist told it is due to loss of cohesion and ds 3 & 1 are involved. What is the diagnosis? \nSelect and explain. \nA. Pemphigus vulgaris, B. Pemphigus foliaceus, C. Bullous pemphigoid, D. Dermatitis herpetiformis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Pemphigus vulgarisa. Pemphigus vulgaris is autoimmuneb. Acantholysis, Nikolsky signc. More than 40 yrsd. Begin in mucosal surfacese. Severe skin painf. Blister formed in suprabasal layer of epidermisg. Autoantigens involved are ds3 and ds1 (if skin too)h. Systemic steroids main treatment', 'role': 'assistant'}]