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
The "hanging drop appearance in the maxillary sinus radiograph indicates: 
Select and explain. 
A. A nasal polyp, B. A blow out # of the orbit, C. A radiograph artifact, D. An antrolith
B: A blow out # of the orbit
Answer: B: A blow out # of the orbit 
Explanation: None