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
Haversian systems (osteons) are found primarily in the 
Select and explain. 
A. Spongy bone, B. Periosteum, C. Alveolar bone proper, D. Endosteum
C: Alveolar bone proper
Answer: C: Alveolar bone proper 
Explanation: None