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
Part of the orbit that fractures in blow out fracture of orbit is 
Select and explain. 
A. Lateral wall, B. Floor of the orbit, C. Superior wall, D. Medial wall
B: Floor of the orbit
Answer: B: Floor of the orbit 
Explanation: The weakest plate of bone, most commonly the orbital floor, fractures, and the orbital contents herniate down into the maxillary antrum. This soft-tissue herniation may lead to muscular dysfunction, particularly the inferior oblique and inferior rectus, leading to failure of the eye to rotate upwards.