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: 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: None', 'role': 'assistant'}]