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': 'A 55 Yr old smoker presents with history of 5 episodes of macroscopic hematuria each lasting for about 4-5 days in the past 5 yrs. Which of the following investigations should be performed to evaluate the suspected cause \nSelect and explain. \nA. Urine microscopy and cytology, B. X-Ray KUB, C. US KUB, D. DTPA scan', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]