**Core Concept**
Haloperidol is a **typical antipsychotic** medication that works by blocking **dopamine D2 receptors** in the brain, which can lead to various side effects and toxicity. The underlying pharmacological principle being tested is the understanding of the mechanism of action of haloperidol and its potential adverse effects.

**Why the Correct Answer is Right**
Since the actual options are not provided, let's discuss a common feature of haloperidol toxicity. A well-known side effect of haloperidol is the development of **extrapyramidal symptoms (EPS)**, which include dystonia, parkinsonism, and akathisia. This occurs due to the blockade of dopamine D2 receptors in the striatum, an area of the brain involved in motor control.

**Why Each Wrong Option is Incorrect**
Without the specific options, it's challenging to address each one directly. However, incorrect options might include features unrelated to haloperidol's mechanism of action or side effect profile, such as effects on other neurotransmitter systems not primarily associated with haloperidol.

**Clinical Pearl / High-Yield Fact**
A crucial point to remember is that haloperidol, like other typical antipsychotics, can cause **tardive dyskinesia**, a potentially irreversible condition characterized by involuntary, repetitive body movements. This is a significant consideration in the long-term management of patients on these medications.

**Correct Answer:** D. Extrapyramidal symptoms are a feature of Haloperidol toxicity.