Chlorpromazine is the correct answer because it is a medication that belongs to the class of phenothiazines, commonly used as an antipsychotic drug. It is primarily used to treat symptoms of schizophrenia, bipolar disorder, and severe behavioral problems. Chlorpromazine works by blocking certain chemicals in the brain, helping to restore the balance of neurotransmitters and reducing symptoms such as hallucinations, delusions, and agitation. It is available in various forms, including tablets, injections, and syrups. Other options listed are also antipsychotic medications, but chlorpromazine is the most commonly used and well-known among them.