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: Surgery
Scaphoid fracture at waist with retrograde blood supply. Which segment is most susceptible to avascular necrosis? 
Select and explain. 
A. Proximal, B. Distal, C. Middle, D. Scaphoid tubercle
A: Proximal
Answer: A: Proximal 
Explanation: Answer- A. ProximalMost common site of scaphoid fracture is Waist.Fractures can occur essentially anywhere along the scaphoid, but distribution is not even:waist of scaphoid: 70-80%proximal pole: 20%distal pole (or so-called scaphoid tubercle): 10%