This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autoimmune skin disorders, Subject name: Dental
Max Joseph&;s space is a histopathological feature of 
Select and explain. 
A. Psoriasis vulgaris, B. Lichen planus, C. Pityriasis rosea, D. Parapsoriasis
B: Lichen planus
Answer: B: Lichen planus 
Explanation: Max Joseph's space is a characteristic histological finding seen in lichen planus. These are small clefts formed due to dermoepidermal separation and basal cell degeneration character histopathology in lichen planus basal cell degeneration interface lymphocyte infiltration compact hyperkeratosis wedge shaped hypergranulosis- wickham straie saw tooth appearence Civattee bodies/ hyaline bodies-apoptosis basal cells. IADVL textbook of dermatology page 1078