This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
[{'content': 'Drug locally used for tracheal stenosis \nSelect and explain. \nA. Mitomycin C, B. Doxorubicin, C. Bleomycin, D. Clindamycin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mitomycin can be used for treatment given by iv route Esophagal carcinoma Breast cancer Given by local route Superficial bladder cancer Eye surgery Esophageal and tracheal stenosis Ref Molecular biology 2006,360', 'role': 'assistant'}]