Phenothiazine medication exert their antiemetic properties by:A. promoting the secretion of hormones in the brain that depress the function of the medulla oblongata.B. antagonizing dopaminergic receptor sites in the brain, which suppresses the function of the hypothalamus.C. blocking histamine-2 receptors, which inhibits gastric acid production and slows peristalsis.D. activating dopaminergic receptors in the brain and releasing hormones that depress the reticular activating system.

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