**Core Concept**
Ocular bobbing is a type of abnormal eye movement characterized by a downward movement of the eyes followed by a rapid return to the midline position. This phenomenon is often associated with midbrain lesions and is a significant clinical sign in the assessment of patients with neurological disorders.

**Why the Correct Answer is Right**
The ocular bobbing centre is located in the midbrain, specifically in the rostral interstitial nucleus of the medial longitudinal fasciculus (riMLF). This nucleus receives inputs from the superior colliculus and the pretectal nuclei, which are involved in the coordination of eye movements. In patients with midbrain lesions, damage to the riMLF can lead to the disruption of normal eye movement control, resulting in the characteristic ocular bobbing seen in these patients.

**Why Each Wrong Option is Incorrect**
**Option A:** While the superior colliculus is involved in the coordination of eye movements, it is not the primary centre responsible for ocular bobbing.
**Option B:** The pretectal nuclei are involved in the pupillary light reflex, but they are not directly related to the control of eye movements in the context of ocular bobbing.
**Option C:** The paramedian pontine reticular formation (PPRF) is involved in the control of horizontal eye movements, but it is not the primary centre responsible for ocular bobbing.

**Clinical Pearl / High-Yield Fact**
Ocular bobbing is often associated with other clinical signs of midbrain lesions, such as pinpoint pupils, light-near dissociation, and impaired vertical eye movements. It is an important clinical sign that can help differentiate between various neurological disorders.

**Correct Answer:** C. Midbrain.