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: 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: Nigro regimen is a Combined Modality Therapy (CMT) for malignant tumors of the anal canal. Nigro regimen comprises of combined chemotherapy and radiotherapy (chemoradiation) for primary treatment of malignant tumors of the anal canal. Ref: Bailey and Love's Sho Practice of Surgery, 25th Edition, Page 1269; Clinical Scenarios In Surgical Oncology By Vijay P. Khatri, Page 167", 'role': 'assistant'}]