<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 28-year-old man is brought to the emergency department after being struck by a car an hour ago as he was crossing the street. He did not lose consciousness. He is complaining of pain in his right arm, forehead, and pelvis. He also has the urge to urinate, but has been unable to do so since the accident. He takes no medications. His temperature is 37.1C 98.9F, pulse is 72min, respirations are 18min, and blood pressure is 11882 mm Hg. There are abrasions over his scalp and face and a 1x3 cm area of ecchymosis above his right eye. Abdominal examination shows suprapubic tenderness. There is a scant amount of blood at the urethral meatus. There is no cervical spinal tenderness. Musculoskeletal examination shows tenderness and ecchymosis over his right distal forearm. An x-ray of the pelvis shows a fracture of the pelvic ramus. A CT scan of the head and neck show no abnormalities. Which of the following is the best next step in the management of this patient?? A: Retrograde urethrogram, B: IV pyelogram, C: Contrast-enhanced CT scan of the abdomen, D: Foley catheterization, E: Retroperitoneal ultrasound,  <response>: This is a patient who was struck by a car and is now experiencing pain in his right arm, forehead, and pelvis along with an inability to urinate. He has abrasions, ecchymosis, and tenderness on exam. Imaging shows a pelvic fracture but no cervical spine injury or intracranial abnormalities. The inability to urinate could indicate a urethral injury, so the next step should be to evaluate for this. A retrograde urethrogram allows for direct visualization of the urethra and identification of any injuries. IV pyelogram, CT scan, and ultrasound would not directly evaluate the urethra. Foley catheterization could worsen an injury if present.A: Retrograde urethrogram 