Most antipsychotic medications exert which of the following effects on the central nervous system (CNS) （）
A. Stimulate the CNS by blocking postsynaptic dopamine, norepinephrine, and serotonin receptors.
B. Sedate the CNS by stimulating serotonin at the synaptic cleft.
C. Depress the CNS by blocking the postsynaptic transmission of dopamine, serotonin, and norepinephrine.
D. Depress the CNS by stimulating the release of acetylcholine.
