Which of the following medication classifications is not considered a cytotoxic chemotherapy agent?

Choice A rationaleAlkylating agents are cytotoxic and work by damaging DNA, preventing cancer cell replication.Choice B rationaleAntitumor antibiotics are cytotoxic and interfere with DNA or RNA synthesis, inhibiting cancer cell growth.Choice C rationaleOpiate antagonists are not used in cancer treatment but to reverse opioid overdoses by blocking opioid receptors.Choice D rationaleAntimetabolites are cytotoxic and interfere with DNA and RNA growth by substituting for the normal building blocks of RNA and DNA.