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
Transrectal ultrasonography in carcinoma prostate is most useful for – 
Select and explain. 
A. Guided prostatic biopsies, B. Seminal vesicle involvement, C. Measurement of prostatic volume, D. To detect hypoechoic area
A: Guided prostatic biopsies
Answer: A: Guided prostatic biopsies 
Explanation: The major role of transrectal USG is to guide prostatic biopsies.