This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
All are pierced in Lumbar Puncture except 
Select and explain. 
A. Post longitudinal ligament, B. Ligamentum Flavum, C. Interspinous Ligament, D. Supraspinous ligament
A: Post longitudinal ligament
Answer: A: Post longitudinal ligament 
Explanation: 1 lies Anterior to the spinal cord