This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'Which of the following statements is true for Nigro&;s regimen \nSelect and explain. \nA. It is a regimen for anal canal neoplasm, B. It incorporates chemotherapy with radiation as an alternative to surgery, C. Has the advantage of preserving continence, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Nowadays, primary treatment of Anal cancer is by chemoradiotherapy , the chemotherapy sually including a combination of 5-fluorouracil (5-FU) with mitomycin C or cisplatin. Ref: Bailey & Love&;s Sho Practice of Surgery,E25,Page-1269', 'role': 'assistant'}]