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
The Haversian system is found in: 
Select and explain. 
A. Diaphysis of long bones, B. Cancellous bone, C. Epiphysis, D. Spongy bones of children
A: Diaphysis of long bones
Answer: A: Diaphysis of long bones 
Explanation: A i.e. Diaphysis of long bones