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: Skin
[{'content': 'A 24 years old (middle aged) female has flaccid bullae in the skin and persistent painful oral erosions (palatal & vestibular lesions in buccal mucosa). Histopathology shows intraepidermal acantholytic blister. The most likely diagnosis is \nSelect and explain. \nA. Bullous Pemphigoid., B. Erythema multiforme, C. Pemphigus vulgaris., D. Dermatitis herpetiformis.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Pemphigus vulgaris', 'role': 'assistant'}]