Osteomeatal complex (OMC) connects-: (A) Nasal cavity with maxillary sinus, (B) Nasal cavity with sphenoid sinus, (C) The two nasal cavities, (D) Ethmoidal sinus with ethmoidal bulla
Answer is A. 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.