**Core Concept:** The internal capsule is a white matter tract in the brain, consisting of the anterior limb, the body, and the posterior limb. It plays a significant role in the transmission of motor and sensory information between the cerebral hemispheres and the rest of the brain. The retrolenticular part of the internal capsule (RLPIC) is involved in the transmission of sensory and motor information between the cerebral hemispheres and the brainstem.

**Why the Correct Answer is Right:**

Correct Answer: C. Optic Radiation

The optic radiation is a part of the visual pathway that involves the processing of visual information from the retina to the occipital lobe, bypassing the retrolenticular part of the internal capsule (RLPIC). Since optic radiation does not pass through the RLPIC, option C is the correct answer.

**Why Each Wrong Option is Incorrect:**

A. Corpus Callosum: Although the corpus callosum is a significant white matter tract in the brain, it passes through the RLPIC, making it the incorrect choice.

B. Anterior Limb of the Internal Capsule: Similar to option A, the anterior limb of the internal capsule also passes through the RLPIC, making it an incorrect choice.

D. Posterior Limb of the Internal Capsule: The posterior limb of the internal capsule is involved in the transmission of motor information between the cerebral hemispheres and the rest of the brain, which includes the motor cortex and the brainstem. Thus, it passes through the RLPIC, making it an incorrect choice.

**Clinical Pearl / High-Yield Fact:**

The understanding of the internal capsule and its various components is crucial for clinical scenarios involving brain injuries or disorders affecting the white matter tracts. For example, a lesion involving the RLPIC could cause a wide range of neurological deficits, including visual disturbances, motor weakness, and cognitive impairments.