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: Orthopaedics
Investigation of choice for lumbar prolapsed disc 
Select and explain. 
A. X-ray, B. CT Scan, C. MRI, D. Myelogram Patt
C: MRI
Answer: C: MRI 
Explanation: Investigation of choice for PID at any level is MRI.