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: Anaesthesia
Structure (s) pierce in Lumber spinal puncture is/are – a) Ligamentum flavumb) Duramaterc) Supraspinous ligamentd) Anterior longitudinal ligamente) Posterior longitudinal ligament 
Select and explain. 
A. abc, B. bc, C. acd, D. bcd
A: abc
Answer: A: abc 
Explanation: Structure pierced during SA (from outside in) are :- Skin → subcutaneous tissue → Supraspinous & interspinous ligament → Ligament flavum → Duramatter → Arachnoid matter.