Collectively, the hollow cavities in the maxillae, ethmoid, sphenoid, and frontal bones are called the sinuses..

The answer to this question would be: paranasal sinus.

There are a few sinuses near the face area. The sinus can be classified based on the bone that makes then to sinus maxillae, ethmoid, sphenoid and frontalis. This structure frequently gets infected causing sinusitis. Sinusitis patient can complain pain or feel the sinus got filled with some liquid.

The answer would be b. it is a learned trait