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: Unknown
[{'content': 'TRUS in carcinoma prostate is most useful for? \nSelect and explain. \nA. Seminal vesicle involvement, B. Measurement of prostatic volume, C. Guiding the Diagnostic biopsies, D. To detect focal area hypo echoic of malignancy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Transrectal ultrasound is indicated for prostate in early!\nlocalized prostate carcinoma, as it is the most accurate method for staging the local disease and also guided biopsy\nfrom suspicious areas of prostate (when S. PSA has been found to be elevated)..', 'role': 'assistant'}]