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
Treatment of choice for erythrodermic psoriasis: 
Select and explain. 
A. Methotrexate, B. Coicosteroids, C. Coal tar topical, D. Topical steroids
A: Methotrexate
Answer: A: Methotrexate 
Explanation: Ans: A. Methotrexate (Ref Fitzpatrick 6/e p2676)Methotrexate or oral retinoids (Acitretin) - DOC for erythrodermic psoriasis management.Current use of methotrexate to treat psoriasis is most common in patients with severe or refractory plaque-type disease that requires systemic treatment.It is also very useful for erythrodermic and pustular psoriasis, as well as psoriatic ahritis.