This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inflammatory Bowel Diseases, Subject name: Medicine
Drug of choice for acute exacerbation of ulcerative colitis is? 
Select and explain. 
A. Sulfasalazine, B. Mesalazine, C. Steroids, D. NSAID's
C: Steroids
Answer: C: Steroids 
Explanation: Ans. (c) SteroidsRef: Harrison's 18/e, chapter 295