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
TRUS in carcinoma prostate is most useful for? 
Select and explain. 
A. Seminal vesicle involvement, B. Measurement of prostatic volume, C. Guiding the Diagnostic biopsies, D. To detect focal area hypo echoic of malignancy
C: Guiding the Diagnostic biopsies
Answer: C: Guiding the Diagnostic biopsies 
Explanation: Transrectal ultrasound is indicated for prostate in early!
localized prostate carcinoma, as it is the most accurate method for staging the local disease and also guided biopsy
from suspicious areas of prostate (when S. PSA has been found to be elevated)..