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': 'Alveolar bone is: \nSelect and explain. \nA. Compact bone, B. Cancellous bone, C. Spongy bone, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]