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: Surgery
Which of the following is the investigation of choice for assessment of depth of penetration and perirectal nodes in rectal cancer - 
Select and explain. 
A. Trans rectal ultrasound, B. CT Scan pelvis, C. MRI Scan, D. Double contrast Barium enema
C: MRI Scan
Answer: C: MRI Scan 
Explanation: Ans. is 'c' i.e., M.R.I. Scan