Question

a patient is suffering from the inability to distinguish various types of odors. this patient may have damage to which of the following?
a) olfactory nerve (i)
b) hypoglossal nerve (xii)
c) facial nerve (viii)
d) vagus nerve (x)

Explanation:

The olfactory nerve (I) is responsible for the sense of smell. Damage to it would lead to an inability to distinguish odors. The hypoglossal nerve (XII) controls tongue movement. The facial nerve (VII) is involved in facial expressions, taste (anterior 2/3 of tongue), etc. The vagus nerve (X) has functions related to internal organs, speech, etc.

Answer:

A. olfactory nerve (I)