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
Which of the following is the most troublesome source of bleeding during a radical retropubic prostatectomy. 
Select and explain. 
A. Dorsal venous complex, B. Inferior vesical pedicle, C. Superior vesical pedicle, D. Seminal vesicular aery
A: Dorsal venous complex
Answer: A: Dorsal venous complex 
Explanation: 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