This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
[{'content': 'An antibiotic not acting on tubulin is \nSelect and explain. \nA. Bleomycin, B. Colchicine, C. Paclitaxel, D. Vincristine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ANSWER: (A) BleomycinREF: Goodman Gillman manual of pharmacology and therapeutics 2008 edition various pages, h ttp://e n. wikipe dia. org/wiki/ Spindle_poisonMitotic spindle poisons:These poisons disrupt cellular reproduction by affecting the protein threads which connect the centromere regions of chromosomes, known as spindles (tubulin).MebendazoleColchicineGriesofulvinVinca Alkaloids (vincristine, vinblastine)Paclitaxel (Taxans)', 'role': 'assistant'}]