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': 'Ligation of cord in orchidectomy for treatment of testicular tumor is done at - \nSelect and explain. \nA. External ring, B. Internal ring, C. Base of scrotum, D. Just above epididiymis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: • The cord must be ligated as close as possible to the internal ring to facilitate complete removal of cord tissue\xa0in case a later retroperitoneal lymph node dissection is required.', 'role': 'assistant'}]