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: Dental
[{'content': 'Causes of erythroderma – a) Pityriasis albab) Pityriasis versicolorc) Psoriasisd) Lichen planuse) Eczema \nSelect and explain. \nA. ab, B. cde, C. acd, D. bd', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]