This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Psoriasis, Subject name: Dental
[{'content': 'DOC for Psoriatic ahropathy? \nSelect and explain. \nA. Methotrexate, B. 5FU, C. PUVA, D. Steroid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Methotrexate is DOC for Psoriatic ahropathy Psoriatic erythroderma Methotrexate is contraindicated in pregnancy and children. DOC for: Psoriatic ahritis- Methotrexate Erythrodermic psoriasis- Methotrexate Pustular psoriasis- Acitretin > Methotrexate Impetigo herpetiformis- Systemic steroids> cyclosporine', 'role': 'assistant'}]