This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastro-Intestinal Tract, Subject name: Pharmacology
The preferred drug for controlling an acute exacerbation of ulcerative colitis is: 
Select and explain. 
A. Prednisolone, B. Sulfasalazine, C. Mesalazine, D. Vancomycin
A: Prednisolone
Answer: A: Prednisolone 
Explanation: - Coicosteroids are the mainstay of treatment of acute exacerbation of ulcerative colitis. - so, among the given options prednisolone is best to be used in controlling acute exacerbation of ulcerative colitis