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
DOC of pustular psoriasis 
Select and explain. 
A. PUVA, B. Methotrexate, C. Steroid, D. Cyclophosphamide
B: Methotrexate
Answer: B: Methotrexate 
Explanation: B i.e. Methotrexate