This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Targeted Anticancer Drugs and Immunosuppressants, Subject name: Pharmacology
Which of the following drug is used for treatment for steroid resistant Crohn's disease? 
Select and explain. 
A. Leflunomide, B. Mesalamine, C. Infliximab, D. None of the above
C: Infliximab
Answer: C: Infliximab 
Explanation: Inflammatory Bowel Disease Ulcerative Colitis - Drug of choice is 5 - ASA preparation e.g. Sulfasalazine, Mesalamine - If these are not effective then steroids are used. Crohn's Disease - Drug of choice for Crohn's disease is steroids - TNF-alpha inhibitors are used in steroid resistant cases IN-Infliximab C- Ceolizumab A-Adalimumab G-Golimumab E- Etanercept - These TNF -alpha inhibitors are contraindicated in TB and Hepatitis- B.