This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Anatomy
[{'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: Radical retropubic prostatectomy is performed for Ca Prostate. Haemorrhage is the most common intraoperative complication and the most commonly injured vessel is Dorsal venous complex. Ref : Cambell's Urology 8/e p3126", 'role': 'assistant'}]