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': 'A 55 year old patient presents with history of five episodes of macroscopic hematuria each lasting for about 4 to 5 days in the past five years. Which of the following investigations should be performed to evaluate the suspected diagnosis. \nSelect and explain. \nA. X ray KUB, B. Ultrasound KUB, C. DTPA scan, D. Urine microscopy and cytology', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]