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 is the most troublesome source of bleeding during a radical retropubic prostatectomy? \nSelect and explain. \nA. Dorsal venous complex, B. Inferior vesical pedicle, C. Superior vesical pedicle, D. Seminal vesicular aery', 'role': 'user'}, {'content': "Answer: A \nExplanation: Main source of potential bleeding during prostatectomy is the dorsal vein complex that passes over the prostate gland. Ref: Prostate Cancer: Science and Clinical Practice By Jack H. Mydlo, Ciril J. Godec, 2003, Page 281; Joan and Sanford I Weill. C. Cornell Urology- Review Aicle 'Prostatectomy'", 'role': 'assistant'}]