Final answer:
The classification that does not include antineoplastic agents in chemotherapy is alkylating agents.
Step-by-step explanation:
The classification that does not include antineoplastic agents in chemotherapy is <strong>alkylating agents</strong>. Alkylating agents are a class of chemotherapy drugs that work by adding alkyl groups to DNA strands, which prevents the DNA from replicating and ultimately kills the cancer cells. Antineoplastic agents, on the other hand, refer to a broader category of drugs that are specifically used to treat and prevent the growth of neoplastic (cancer) cells. This category includes drugs such as antimetabolites, plant alkaloids, and topoisomerase inhibitors.