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
Osteomeatal complex (OMC) connects- 
Select and explain. 
A. Nasal cavity with maxillary sinus, B. Nasal cavity with sphenoid sinus, C. The two nasal cavities, D. Ethmoidal sinus with ethmoidal bulla
A: Nasal cavity with maxillary sinus
Answer: A: Nasal cavity with maxillary sinus 
Explanation: The osteomeatal complex is a narrow anatomical region consisting of:-


Multiple bony structures (middle turbinate, uncinate process, Bulla ethmoidalis).
Air spaces (frontal recess, ethmoidal infundibulum, middle meatus)
Ostia of anterior ethmoidal, maxillary and frontal sinuses → , therefore, connects these sinuses to nasal cavity.