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
[{'content': 'In epidural lumbar puncture, all structure 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: A i.e. Posterior longitudinal ligamentPosterior longitudinal ligament lies along the posterior surface of veebral bodies. So it would not be pierced during lumber puncture.', 'role': 'assistant'}]