**Core Concept**
Resperidone, a second-generation antipsychotic, is a dopamine D2 receptor antagonist with potent serotonin 5-HT2A receptor antagonist properties. Its pharmacological action is crucial in managing schizophrenia and bipolar disorder. However, it also carries significant side effects due to its receptor binding profile.

**Why the Correct Answer is Right**
Resperidone's mechanism of action involves blocking the D2 receptors in the mesolimbic pathway, which is involved in the regulation of motor function and the coordination of movement. This blockade can lead to an increased risk of extrapyramidal side effects (EPS), including dystonia, parkinsonism, and tardive dyskinesia. Additionally, resperidone's potent 5-HT2A receptor antagonism can lead to an increased risk of hyperprolactinemia, which is characterized by elevated levels of prolactin in the blood. This is due to the inhibition of dopamine release in the tuberoinfundibular pathway, which normally inhibits prolactin release.

**Why Each Wrong Option is Incorrect**
**Option A:** Not a relevant side effect of resperidone.
**Option B:** Not a common side effect of resperidone.
**Option C:** Not a recognized side effect of resperidone.

**Clinical Pearl / High-Yield Fact**
When managing patients on resperidone, it is essential to monitor for signs of EPS and hyperprolactinemia, such as tremors, rigidity, and galactorrhea. Regular monitoring of prolactin levels and adjusting the dosage or switching to an alternative antipsychotic may be necessary to mitigate these risks.

**Correct Answer:** C