This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skin, Subject name: Pathology
[{'content': '50-year-old female presents with blisters and erosions on the skin and mucous membranes, most commonly inside the mouth. Diagnosis? \nSelect and explain. \nA. Pemphigus vulgaris, B. Dermatitis herpetiformis, C. Bullous pemphigoid, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Pemphigus vulgarisEarly lesions of pemphigus vulgaris show suprabasal epidermal acantholysis, clefting and blister formationBasal cells are intact giving tombstone patternThe blister cavity may contain inflammatory cells including eosinophils and rounded acantholytic cells with intensely eosinophilic cytoplasm and a perinuclear halo.', 'role': 'assistant'}]