This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Antibiotics, Subject name: Pharmacology
[{'content': 'DOC for Listeria monocytogenes \nSelect and explain. \nA. Penicillin G, B. Nitrofurantoin, C. Ampicillin, D. Ofloxacin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Aminopenicillins Ampicillin It is active against all organisms sensitive to PnG. In addition, many gram-negative bacilli, e.g. H. influenzae, E. coli, Proteus, Salmonella Shigella and Helicobacter pylori are inhibited. Ampicillin is more active than PnG for Strep. viridans, enterococci and Listeria monocytogenes; equally active for pneumococci, gonococci and meningococci (penicillin-resistant strains are resistant to ampicillin as well); but less active against other gram-positive cocci. Ref:- kd tripathi; pg num:-722', 'role': 'assistant'}]