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
[{'content': 'Ustekinumab is used in \nSelect and explain. \nA. Lichen planus, B. Psoriasis, C. Darier disease, D. Pemphigus', 'role': 'user'}, {'content': "Answer: B \nExplanation: 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", 'role': 'assistant'}]