This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Medicine
Drug used in acute exacerbation of ulcerative colitis is 
Select and explain. 
A. Sulfasalazine, B. Steroids, C. Infliximab, D. Cyclosporine
D: Cyclosporine
Answer: D: Cyclosporine 
Explanation: Cyclosporine is used for acute exacerbation of ulcerative colitis, and also as rescue therapy to prevent surgery in ulcerative colitis responding poorly to glucocoicoids. Reference : Davidson, 23rd Edition, page no : 821.