Final answer:
Bleomycin is the drug classified as an antimetabolite.
Step-by-step explanation:
Out of the three options given, the drug that is classified as an antimetabolite is bleomycin. Antimetabolites are drugs that interfere with the normal metabolic processes of cells by mimicking the structure of essential molecules.
Bleomycin is an antibiotic that works as an antimetabolite by inhibiting DNA synthesis and causing breaks in the DNA strand, which ultimately leads to cell death.