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': "Kogoj's pustules are seen in? \nSelect and explain. \nA. Lichen planus, B. Pemphigus vulgaris, C. Mycosis fungoides, D. Psoriasis vulgaris", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is'd'i.e., Psoriasis vulgarisOn histopathological examination of psoriasis lesion there is accumulation of polymorphs in stratum malpighi layer. These clusters are known as Kogoj pustules.", 'role': 'assistant'}]