This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Papulosquamous disorders, Subject name: Dental
Ustekinumab is used in 
Select and explain. 
A. Lichen planus, B. Psoriasis, C. Darier disease, D. Pemphigus
B: Psoriasis
Answer: B: Psoriasis 
Explanation: Ustekinumab acts by blocking interleukin IL-12 and IL-23 which help to activate T-cells. Used to treat psoriasis, was also approved to treat Crohn's disease. Other biologics approved in psoriasis are anti-TNF alpha agents Etanercept, Adalimumab, Infliximab, Golimumab Ref: Harrison 19e pg: 348