This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Prostate Cancer, Subject name: Surgery
[{'content': 'A 72 yrs. old man, Dayaram is found on examination to have a prostatic nodule. Best investigation to evaluate him : \nSelect and explain. \nA. CT scan pelvis, B. IVP, C. Prostatic massage for examination of secretions, D. Transrectal U/S', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is \'d\' ie Transrectal U/S "TRUS (Transrectal U/S) remains the most accurate method of staging the local disease (prostatic cancer)/\' - Bailey & Love', 'role': 'assistant'}]