This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
Blow-out fracture refers to 
Select and explain. 
A. Fracture of orbit, B. Fracture of nasal septum, C. Fracture base of skull, D. Fracture of mandible
A: Fracture of orbit
Answer: A: Fracture of orbit 
Explanation: Isolated fractures of orbital floor, which occur when a large blunt object strikes the globes, are known as 'blow-out fractures' Ref: Textbook of diseases of ENT; PL Dhingra;7th edition, pg 206