This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rectum and anal canal, Subject name: Surgery
[{'content': 'Treatment of stage II carcinoma anal canal: \nSelect and explain. \nA. APR, B. APR followed by chemoradiation, C. Concurrent chemoradiation, D. Neoadjuvant chemotherapy followed by Surgery', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Anal Canal Carcinoma- - NIGRO regimen - Chemotherapy followed by radiation * 5- fluorouracil + Mitomycin-C followed by radiation', 'role': 'assistant'}]