This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Eczema and related disorders, Subject name: Dental
[{'content': 'The following are effective in the management of eczema: \nSelect and explain. \nA. Topical betamethasone, B. Topical alpha-tocopherol, C. Dithranol, D. Calcipotriol', 'role': 'user'}, {'content': "Answer: A \nExplanation: Topical coicosteroids are required both in 'wet' and 'dry' eczema. Betamethasone is a high-potency topical glucocoicoid. In mild wet eczema, the topical use of drying agents such as lotions of aluminium acetate or calamine are useful. When the lesions are dry and scaly the use of emollients combined with a keratolytic is beneficial. Nocturnal pruritus may be relieved by sedative antihistamines.", 'role': 'assistant'}]