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
[{'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: • Most often, the urine is often obtained from a voided specimen.\n• In children who are not toilet trained, a urine collection device, such as a bag, is placed over the genitalia, and the urine is cultured from the bagged specimen.\n• Suprapubic aspiration avoids potential contamination; however, due to its invasiveness, it is rarely used except in children and selected patients.\n• 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.', 'role': 'assistant'}]