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
[{'content': 'Drug effective in ulcerative colitis is : \nSelect and explain. \nA. 5 amino salicyclic acid (5-ASA), B. Steroids, C. Salazopyrin, D. Antibiotics', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' 5 Amino salicylic acid", 'role': 'assistant'}]