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
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 – 
Select and explain. 
A. Systemic corticosteroids, B. Thalidomide, C. Azathioprine, D. Cyclosporine
C: Azathioprine
Answer: C: Azathioprine 
Explanation: Treatment of Allergic contact dermatitis


Topical corticosteroids in combination with oral antihistaminics are effective in most cases.
Extensive contact dermatitis may require treatment with a short course of oral corticosteroids.
In air-borne contact dermatitis, azathioprine may be effective.

As corticosteroids are contraindicated in patients with DM and hypertension, best option here would be azathioprine