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
Drug used in the treatment of steroid resistant ulcerative colitiis 
Select and explain. 
A. Azathioprine, B. Cyclosporine, C. 5ASA, D. Racecadotril
B: Cyclosporine
Answer: B: Cyclosporine 
Explanation: None