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: Pharmacology
ALL of the following drugs have immunosuppressive effects, EXCEPT: 
Select and explain. 
A. Cyclosporine, B. Cefaclor, C. Azathioprine, D. Steroids
B: Cefaclor
Answer: B: Cefaclor 
Explanation: Cefaclor is a second generation cephalosporin and is not known to have any immunosuppressive effects. Coicosteroids is having immunosuppressive propeies. Classification of immunosuppressants according to the WHO: Drugs targeting intracellular ligands: Calcineurin inhibitors Tacrolimus Cyclosporin A Antimetabolites Azathioprine Methotrexate Mycophenolic acid Cladribine Antiproliferative agents Cyclophosphamide Sirolimus Mitoxantrone Drugs targeting cell surface ligands: Monoclonal antibodies Fusion proteins Drugs targeting soluble factors: cytokines: Anti TNF alpha Daclizumab Ref: Immune Regulation and Immunotherapy in Autoimmune Disease By Jingwu Zhang page 297.