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: Anatomy
In epidural lumbar puncture, all structure are pierced except - 
Select and explain. 
A. Posterior longitudinal ligament, B. Ligamentum flavum, C. Interspinous ligament, D. Supraspinous ligament
A: Posterior longitudinal ligament
Answer: A: Posterior longitudinal ligament 
Explanation: Structure pierced during lumbar puncture (from outside in) are :-

Skin → Subcutaneous tissue → Supraspinous & interspinous ligament → Ligament flavum → Dura matter → Arachnoid matter.