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': 'A 9-yr-old boy has multiple itchy erythematous wheals all over the body for 2 days. There is no respiratory difficulty. Which is the best treatment? \nSelect and explain. \nA. Antihelminthics, B. Systemic coicosteroids, C. Antihistamines, D. Adrenaline', 'role': 'user'}, {'content': "Answer: C \nExplanation: Anti-histamines are most often used to control pruritus and mild sedation is responsible for antipruritic action. Sedation may limit their usefulness; however, when used at bedtime, sedating anti-histamines may improve the patient's sleep. Systemic steroids and adrenaline are used in severe cases with respiratory difficulty.", 'role': 'assistant'}]