This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney & Ureturs, Subject name: Surgery
[{'content': 'The Most important diagnostic investigation in renal cell carcinoma is: \nSelect and explain. \nA. CT scan of abdomen and pelvis, B. MRI, C. USG, D. PET CT', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) CT scan of abdomen and pelvisRef: Bailey 26thEdition, Page 1306; Campbell Urology 11th Edition, Page 1338* Most important investigation in RCC is CT scan of abdomen. Staging of RCC can be accomplished in most cases with a high quality abdominal CT scan.', 'role': 'assistant'}]