Question

what is the first cranial nerve and its function?
vestibulocochlear, responsible for hearing and balance.
trigeminal, responsible for facial sensation and chewing.
optic, responsible for vision.
olfactory, responsible for the sense of smell.
glossopharyngeal, responsible for taste and swallowing.

Explanation:

The first cranial nerve is the olfactory nerve. It is responsible for the sense of smell. The vestibulocochlear nerve is for hearing and balance (eighth cranial nerve), the trigeminal nerve is for facial sensation and chewing (fifth cranial nerve), the optic nerve is for vision (second cranial nerve), and the glossopharyngeal nerve is for taste and swallowing (ninth cranial nerve).

Answer:

Olfactory, responsible for the sense of smell.