This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, 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: Metaphysis is the most vascular zone of the bone especially in children as it has long hairpin loop arranged aerioles and venules running through it.(Refer: Mohindra's Fundamentals of Ohopedics, 2nd edition, pg no. 9)