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': 'Treatment of pustular psoriasis is : \nSelect and explain. \nA. Thalidomide, B. Retinoids, C. Hydroxyurea, D. Metholtrexate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Retinoids', 'role': 'assistant'}]