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': 'Acantholysis is seen in: March 2012 \nSelect and explain. \nA. Psoriasis, B. Pemphigus vulgaris, C. Lichen planus, D. Pityriasis versicolor', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans: B i.e. Pemphigus vulgaris Dermatologic conditions and features Psoariasis is a chronic dermatosis characterized by presence at typical sites of well defined erythematous papules and plaques, which are surmounted with large, silvery loose scales. Pemphigus is an intraepidermal bullous disorder, which is characterized clinically by presence of cutaneous and mucosal blisters and histologically by acantholysis (due to deposition of intercellular antibodies) Lichen planus is characterized by 5P's; Pruritic, polygonal, purple (violaceous), plane (flat topped), papules with Wickham's striae on surface Pityriasis versicolor features include perifollicular, hypopigmented (or hyperpigmented), macules surmounted with branny scales", 'role': 'assistant'}]