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
[{'content': '60-yrs-old male with a poor stream of urine, post-void residual urine is 400ml, b/l hydronephrosis and prostate weighing 70 g. His urea is 120 and creates 3.5. Ideal "next immediate" step : \nSelect and explain. \nA. Catheterize with Foley catheter, B. b/1 PC Nephrostomies, C. CT to rule out ca, D. MRI pelvis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Catheterization is mandatory for acute urinary retention. Spontaneous voiding may return, but a catheter should be left indwelling for 3 days while detrusor tone returns."- CSDT 13/e This is a case of bladder outlet obstruction most likely due to BHP (can also be due to ca). So the immediate next step is to drain the bladder a transurethral Foley catheter. If this fails suprapubic drainage can be done. Ref : Bailey and Love 25/e p1316', 'role': 'assistant'}]