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': 'A 55 year old male, with uncontrolled diabetes mellitus and hypertension, developed severe air-borne contact dermatitis. The most appropriate drug for his treatment would be – \nSelect and explain. \nA. Systemic corticosteroids, B. Thalidomide, C. Azathioprine, D. Cyclosporine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Treatment of Allergic contact dermatitis\n\n\nTopical corticosteroids in combination with oral antihistaminics are effective in most cases.\nExtensive contact dermatitis may require treatment with a short course of oral corticosteroids.\nIn air-borne contact dermatitis, azathioprine may be effective.\n\nAs corticosteroids are contraindicated in patients with DM and hypertension, best option here would be azathioprine', 'role': 'assistant'}]