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: Pharmacology
[{'content': 'Drug used for trabeculectomy \nSelect and explain. \nA. Mitomycin-C, B. Azathioprine, C. Cituximab, D. Ketorolac', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The main reason of failure of trabeculectomy surgery is scarring and closure of drainage site\n\xa0Antimetabolites prevent scarring and can be used to increase the success rate of trabeculectomy\n\xa0The most commony used antimetabolites are mitomycin-C and 5-fluorouracil.', 'role': 'assistant'}]