This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroanatomy, Subject name: Anatomy
[{'content': 'In epidural lumbar puncture, all of these structures are pierced EXCEPT: \nSelect and explain. \nA. Posterior longitudinal ligament, B. Ligamentous flavum, C. Interspinous ligament, D. Supraspinous ligament', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. A Posterior longitudinal ligamentRef: Gray's, 38th ed. pg. 512; Keith Moore, 4th ed. pg. 483* Structures pierced during lumbar puncture (from outside in) are:- Skin - subcutaneous tissue - Supraspinous & interspinous ligament - Ligament flavum - Duramater - Arachnoid mater.", 'role': 'assistant'}]