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
Kogoj's pustules are seen in? 
Select and explain. 
A. Lichen planus, B. Pemphigus vulgaris, C. Mycosis fungoides, D. Psoriasis vulgaris
D: Psoriasis vulgaris
Answer: D: Psoriasis vulgaris 
Explanation: 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.