This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autoimmune skin disorders, Subject name: Dental
[{'content': 'Row of tombstones is seen in \nSelect and explain. \nA. Irritant dermatitis, B. Pemphigus Vulgaris, C. Bullous Pemphigoid, D. Paraneoplastic pemphigus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: row of tomb stones: it is a histopathological finding seen in pemphigus vulgaris in pemphigus vulgaris loss of coherence between keratinocytes leads to cleft and bullae in suprabasal zone. the basal cells remain attached to basement membrane but separated with each other producing a row of tomb stone appearence, characteristic of pemphigus vulgaris IADVL textbook of dermatology page 1099', 'role': 'assistant'}]