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
[{'content': 'Structure (s) pierce in Lumber spinal puncture is/are – a) Ligamentum flavumb) Duramaterc) Supraspinous ligamentd) Anterior longitudinal ligamente) Posterior longitudinal ligament \nSelect and explain. \nA. abc, B. bc, C. acd, D. bcd', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Structure pierced during SA (from outside in) are :- Skin → subcutaneous tissue → Supraspinous & interspinous ligament → Ligament flavum → Duramatter → Arachnoid matter.', 'role': 'assistant'}]