This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'A patient comes to u with an ill defined, irregularly shaped gingival erosions which are painful and are of short duration, a few months later skin lesions were also noticed, on histopathological examination Tzanck cells were found, probable diagnosis is: \nSelect and explain. \nA. Lichen planus., B. Pemphigus Vulgaris., C. Angioneurotic oedema., D. Behcet syndrome.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Oral manifestations:\n\nOral lesions common and precede skin lesions by months\nIntact bullae are rare; patients usually present with ill-defined, irregularly shaped, gingival, buccal,\xa0palatal erosions, which are painful and slow to heal\nErosions extend peripherally with shedding of the epithelium.', 'role': 'assistant'}]