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
A 55 yr old male, with uncontrolled diabetes mellitus and hypeension, developed severe airborne contact dermatitis. The most appropriate drug for his treatment would be: 
Select and explain. 
A. Systematic coicosteroids, B. ketoconazole, C. Azathioprine, D. Cyclosporine
C: Azathioprine
Answer: C: Azathioprine 
Explanation: Case of contact dermatitis - Systematic coicosteroids cannot be used because pt. has DM & steroid cause impairment of blood glucose levels in well-controlled diabetics. Cyclosporine cannot be used as pt. is Hypeensive and it is a nephrotoxic drug. ketoconazole is antifungal drug. Therefore, Azathioprine (immunosuppressant) can be used in this case