**Core Concept**
The question is testing the student's knowledge of the anatomy and physiology of taste sensation, specifically the distribution of taste receptors on the tongue. Taste sensation is mediated by taste buds, which are responsible for detecting chemicals in food and drinks and transmitting this information to the brain.

**Why the Correct Answer is Right**
The anterior two-thirds of the tongue is innervated by the facial nerve (cranial nerve VII), which carries taste fibers from the anterior two-thirds of the tongue. These fibers synapse with second-order neurons in the solitary nucleus of the brainstem, which then transmit the taste information to the primary gustatory cortex. The facial nerve also contains motor fibers that control the muscles of facial expression.

**Why Each Wrong Option is Incorrect**
**Option A:** The glossopharyngeal nerve (cranial nerve IX) carries taste fibers from the posterior one-third of the tongue, not the anterior two-thirds.
**Option B:** The vagus nerve (cranial nerve X) is involved in the transmission of taste information from the epiglottis and the pharynx, but not the tongue.
**Option C:** The trigeminal nerve (cranial nerve V) is responsible for transmitting sensory information from the face, including touch, pressure, and temperature, but not taste.

**Clinical Pearl / High-Yield Fact**
It's worth noting that the distribution of taste receptors on the tongue is not strictly divided between the anterior two-thirds and posterior one-third, but rather is more complex and nuanced, with some overlap between the two.

**Correct Answer: C. Vagus nerve is mostly involved in this function.