**Core Concept**
The otolith organs, specifically the saccule and utricle, are a pair of sensory organs within the vestibular system of the inner ear. They play a crucial role in detecting linear acceleration and changes in head position, contributing to our sense of balance and spatial orientation.

**Why the Correct Answer is Right**
The otolith organs contain otoliths, small calcium carbonate crystals, embedded within a gelatinous membrane. As the head moves, these otoliths displace the membrane, stimulating hair cells and sending signals to the brain. This mechanism is essential for detecting changes in linear acceleration, such as when walking, running, or making sharp turns. The otolith organs work in conjunction with the semicircular canals to provide a comprehensive sense of balance and spatial awareness.

**Why Each Wrong Option is Incorrect**
**Option A:** The cochlea, not the otolith organs, is primarily responsible for sound processing and hearing.
**Option B:** The semicircular canals detect rotational acceleration, not linear acceleration, which is the primary function of the otolith organs.
**Option C:** The vestibular nerve, while involved in balance and spatial orientation, is not directly responsible for the function of the otolith organs.

**Clinical Pearl / High-Yield Fact**
The otolith organs are sensitive to changes in linear acceleration, which can be disrupted in conditions such as benign paroxysmal positional vertigo (BPPV) or in individuals with vestibular migraine.

**Correct Answer: C. Detecting rotational acceleration.**