**Core Concept**
The dorsal root ganglion is a critical structure in the peripheral nervous system, serving as a relay station for sensory information from the body to the central nervous system. It contains the cell bodies of sensory neurons that convey various types of sensory information, including pain, temperature, touch, and proprioception.

**Why the Correct Answer is Right**
The dorsal root ganglion is unique in that it is located outside the spinal cord, within the posterior root of the spinal nerve. This is because the cell bodies of sensory neurons are generally located outside the central nervous system, in the peripheral nervous system. The axons of these sensory neurons enter the spinal cord through the posterior root, while their cell bodies remain in the dorsal root ganglion. This arrangement allows for the efficient transmission of sensory information from the body to the central nervous system.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the dorsal root ganglion is not a structure associated with motor neurons, which are responsible for transmitting signals from the central nervous system to muscles and glands.

**Option B:** This option is incorrect because the dorsal root ganglion is not a structure associated with the autonomic nervous system, which regulates involuntary functions such as heart rate and digestion.

**Option C:** This option is incorrect because the dorsal root ganglion is not a structure associated with the sympathetic nervous system, which is a component of the autonomic nervous system.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the dorsal root ganglion is a critical structure for diagnosing and treating various neurological conditions, including neuropathic pain and complex regional pain syndrome. Understanding the anatomy and function of the dorsal root ganglion can help clinicians develop effective treatment plans for these conditions.

**Correct Answer: C. Dorsal root ganglion contains the cell bodies of sensory neurons.**