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
Following road traffic accident, a patient with vague abdominal pain was immediately taken to the operation theatre for emergency laparotomy. On examination, a large, contained, stable, non-pulsatile retroperitoneal hematoma was found on the right side. One-shot IVU shows a barely discernible nephrogram on the right side and prompt uptake and excretion on the left side. What should be the next step to be done? 
Select and explain. 
A. Nephrectomy, B. Isolate the proximal renal vessels, open the Gerota's fascia and explore the kidney, C. Perform on table retrograde pyelography, D. Perform on table angiography
B: Isolate the proximal renal vessels, open the Gerota's fascia and explore the kidney
Answer: B: Isolate the proximal renal vessels, open the Gerota's fascia and explore the kidney 
Explanation: Ans. b. Isolate the proximal renal vessels, open the Gerota's fascia and explore the kidney-'With I7/e p281-286; Campbell 10th/1169-1178; Bailey 26th/1286-1288, 25th/1290-1291; JT Sturm, .IF Perry. Jr and A S Cass. Renal aery and vein injury following blunt trauma.Annals of surgery.Vol. 182 (6: 696-698.)