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: Dental
[{'content': 'Bundle bone is part of \nSelect and explain. \nA. Periodontal ligament, B. Alveolar bone, C. Cementum, D. Longbones', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]