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': 'Keratoderma is a feature of – \nSelect and explain. \nA. Pityriasis rubra pilaris, B. Pemphigus, C. Pityriasis rosea, D. Psoriasis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]