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
Max. Joseph's space is a histopatho-logical feature of: 
Select and explain. 
A. Psoriasis vulgaris, B. Lichen planus, C. Pityriasis rosea, D. Parapsoriasis
B: Lichen planus
Answer: B: Lichen planus 
Explanation: B i.e. Lichen planus