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': 'Membrana tectoria is continuation of: \nSelect and explain. \nA. Anterior longitudinal ligament, B. Posterior longitudinal ligament, C. Anterior atlanto-occipital membrane, D. Posterior atlanto-occipital membrane', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Posterior longitudinal ligament', 'role': 'assistant'}]