This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'Drug of choice for Listeria monocytogenes is \nSelect and explain. \nA. Amoxycillin, B. Ampicillin, C. Vancomycin, D. Amikacin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Non-Spore-Forming Gram-Positive\xa0Bacilli: Corynebacterium, Propionibacterium, Listeria, Erysipelothrix, Actinomycetes, & Related\xa0Pathogens\nMany antimicrobial drugs inhibit listeria in vitro. Clinical cures have been obtained with Ampicillin with\xa0erythromycin, or with intravenous trimethoprim-sulfamethoxazole.\nCephalosporins and fluoroquinolones are not active against L monocytogenes. Ampicillin plus gentamicin\xa0is often recommended for therapy, but gentamicin does not enter host cells and may not\xa0help treat the listeria infection', 'role': 'assistant'}]