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
Pelvic fracture is associated with: 
Select and explain. 
A. Intraperitoneal bladder rupture, B. Extraperitoneal bladder rupture, C. Anterior urethral injury, D. None
B: Extraperitoneal bladder rupture
Answer: B: Extraperitoneal bladder rupture 
Explanation: "The bony pelvis protects the urinary bladder very well. When the pelvis is fractured by blunt trauma, fragments from the fracture site may perforate the bladder. These perforations usually result in extra peritoneal rupture." — Smith's Urology