**Core Concept**
The posterior column of the spinal cord is a critical pathway for transmitting sensory information from the body to the brain. This column is composed of three tracts: the fasciculus gracilis, fasciculus cuneatus, and posterior spinocerebellar tract. These tracts are responsible for transmitting proprioception, vibration, and fine touch information.

**Why the Correct Answer is Right**
The fasciculus cuneatus is a part of the posterior column that transmits sensory information from the upper body, including the arms and shoulders. This tract is responsible for transmitting proprioception, vibration, and fine touch information from the upper body to the brain. The cuneate nucleus in the medulla oblongata receives input from the fasciculus cuneatus and relays this information to the thalamus, which then sends it to the cortex for processing.

**Why Each Wrong Option is Incorrect**
* **Option A:** The lateral spinothalamic tract is a part of the anterolateral system that transmits pain and temperature information from the body to the brain, not from the posterior column.
* **Option B:** The fasciculus gracilis is a part of the posterior column that transmits sensory information from the lower body, including the legs and feet, not from the upper body.
* **Option D:** The rubrospinal tract is a descending motor pathway that originates in the red nucleus of the midbrain and is involved in motor control, not sensory transmission.
* **Option E:** The posterior spinocerebellar tract is a part of the posterior column that transmits information from the spinal cord to the cerebellum, but it is not responsible for transmitting sensory information to the thalamus or cortex.

**Clinical Pearl / High-Yield Fact**
The posterior column tracts are responsible for transmitting proprioception, vibration, and fine touch information from the body to the brain. Damage to these tracts can result in loss of proprioception and fine touch sensation, as well as difficulty with coordination and balance.

**Correct Answer: C. Fasciculus cuneatus**