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
[{'content': 'Which of the following is the drug of choice in the treatment of erythrodermic psoriasis? \nSelect and explain. \nA. Psorialen, B. Systemic steroid, C. Methotrexate, D. Estrogen', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Methotrexate, acitretin or sho course of cyclosporine are the drugs of choice in the treatment of erythrodermic psoriasis. Methotrexate is also the drug of choice in psoriatic ahopathy, chronic plaque psoriasis and pustular psoriasis.', 'role': 'assistant'}]