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: Surgery
[{'content': 'The most reliable urine specimen is obtained by: \nSelect and explain. \nA. urethral catheterization, B. Catheter aspiration, C. Midstream voiding, D. Suprapubic aspiration', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Suprapubic aspiration avoids potential contamination Urinary Tract infection Most often, the urine is often obtained from a voided specimen. In children, who are not toilet trained, a urine collection device, such as bag, is placed over the genitals, and the urine is cultured from the bagged specimen Suprapubic aspiration avoids potential contamination; however due to its invasiveness, it is rarely used except in children and selected patients Urine obtained from a urinary catheter is less invasive than a suprapubic aspiration and is less likely to be contaminated than that from a voided specimen. Ref: Smith 18th edition Pgno: 200', 'role': 'assistant'}]