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: The major role of transrectal USG is to guide prostatic biopsies.', 'role': 'assistant'}]