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: Radiology
[{'content': 'Transrectal ultrasonography in carcinoma prostate is most useful for \nSelect and explain. \nA. Guided prostatic biopsies, B. Seminal vesicle involvement, C. Measurement of prostatic volume, D. To detect hypoechoic area', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Guided prostatic biopsy The major role of transrectal USG is to guide prostatic biopsiesQ.', 'role': 'assistant'}]