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: ENT
[{'content': 'Topical Mitomycin C is useful in treatment of? \nSelect and explain. \nA. Angiofibroma, B. Tracheal stenosis, C. Skull base Ostemyelitis, D. Laryngeal carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Laryngotracheal stenosis treated by serial dilatation using Jackson bronchoscopes. Laser have tendency to recur and hence adjuvant methods are done to decrease the rate of restenosis. Mitomycin C is an example of one of these adjunctive agents. It is a chemical derived from the Streptomyces caespitosus bacterium. It is an alkylating agent which has both antineoplastic and antiproliferative propeies and inhibits fibroblast production and thus prevents restenosis.', 'role': 'assistant'}]