This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal Infections, Subject name: Orthopaedics
Most vascular zone of the bone is - 
Select and explain. 
A. Metaphysis, B. Diaphysis, C. Epiphysis, D. Medullary Cavity
A: Metaphysis
Answer: A: Metaphysis 
Explanation: Ans. is 'a' i.e., Metaphysis o Metaphysis is the most vascular zone of the bone especially in children as it has long hairpin loop arranged arterioles and venules running through it.