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: ENT
Antrum of Highmore is 
Select and explain. 
A. Maxillary, B. Ethmoid, C. Sphenoid, D. Frontal
A: Maxillary
Answer: A: Maxillary 
Explanation: Antrum of Highmore is maxillary sinus.
It is the largest of paranasal sinuses.