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': 'Vitamin D analogue calcitriol is useful in the treatment of – \nSelect and explain. \nA. Lichen planus, B. Psoriasis, C. Phemphigus, D. Leprosy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Drugs for psoriasis\nTopical medications\n\nVitamin D (calcipotriene)\nCool tar\nCorticosteroids\nTree bark extract (dithranol)\nTopical retinoids\n\nSystemic\xa0\xa0\n\nPsoralens (Methoxsalen, trioxsalen) \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\nMethotrexate \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\nAcitretin \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\nEtanercept \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\xa0\nCyclosporine \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\nAlefacept\nTacrolimus\n6-Thioguanine\nHydroxyurea\nTacrolimus\nAdalimumab\n\nPhoto therapy\n\nPUVA (oral psoralen plus UV-A)\nNarrow - band UV-B (NB-UVB)', 'role': 'assistant'}]