<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 58-year-old man presents to the emergency department following a motor vehicle accident where he was an unrestrained passenger. On initial presentation in the field, he had diffuse abdominal tenderness and his blood pressure is 7050 mmHg and pulse is 129min. Following administration of 2 L of normal saline, his blood pressure is 7458 mmHg. He undergoes emergency laparotomy and the source of the bleeding is controlled. On the second post-operative day, his blood pressure is 11071 mmHg and pulse is 90min. There is a midline abdominal scar with no erythema and mild tenderness. Cardiopulmonary examination is unremarkable. He has had 300 mL of urine output over the last 24 hours. Urinalysis shows 12-15 RBChpf, 2-5 WBChpf, and trace protein. What additional finding would you expect to see on urinalysis?? A: WBC casts, B: RBC casts, C: Hyaline casts, D: Muddy brown casts, E: Fatty casts,  <response>: This is a clinical vignette describing a 58-year-old man who was in a motor vehicle accident and underwent emergency laparotomy for intra-abdominal bleeding. He is now 2 days post-op and his vital signs have stabilized. He has mild abdominal tenderness, trace proteinuria, hematuria, and pyuria on urinalysis. The question is asking what additional finding would be expected on urinalysis in this patient. The history of trauma, hypotension, and abdominal surgery raise suspicion for acute kidney injury. In acute tubular necrosis, one would expect to see muddy brown granular casts on urinalysis due to sloughing of necrotic tubular epithelial cells.D: Muddy brown casts 