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
Motorcyclist's fracture: 
Select and explain. 
A. Ring fracture, B. Comminuted fracture, C. Separation of suture between anterior and posterior half of skull., D. Fracture base of skull
A: Ring fracture
Answer: A: Ring fracture 
Explanation: A. i.e. Ring fracture: Motorcyclist's fracture is a ring fracture of skull baseQ, separating the rim of foramen magnum from rest of the base. It usually results due to sudden anteroflexion of cervical spine without impact on occiput caused usually by veical deceleration injury (fall from height) or rarely motorcycle accident. Motorcyclist can sustain ring fracture and pillion rider (i.e. atlantooccipital avulsion with dural tear).