<prompt> Methotrexate is what class of anti cancer drug -Alkylating agentsAntimetabolitesMicrotubule damaging agentsTopoisomerase inhibitors  <response>: Ans. is b i.e., Antimetabolites o Alkylating agents Nitrogen mustards -Mechlorethamine, cyclophosphamide, Ifosfamide, chlorambucil, Melphalan. Ethylenimine -Thio - TEPA Alkyl sulfonate -Busulfan Nitrosoureas -Carmustine, Lomustine Triazine -Dacarbazine, Procarbazine Others -Altretamine, cisplatin, carboplatin, oxaliplatin.o Antimetabolites Folate antagonist- Methotrexate, Pemetrexed. Purine antagonist-6 - Mercaptopurine, 6-Thioguanine, Azathioprine, Fludarabine. Pyrimidine antagonist-5 - Fluorouracil, cytarabine cytosine - arabinaside.o Vinca alkaloids - Vincristin oncovin, vinblastin, vinorelbineo Taxanes -Paclitaxel, Docetaxelo Epipodophyllotoxin -Etoposideo Camptothecin analogue-Topotecan, Irinotecano Antibiotics-Actinomycin D Dactinomycin, Doxorubicin, Daunorobicin Rubidomycin, Mitoxantrone, Bleomycin, Mitomycin C.o Miscellaneous-L-Asparginase. 