This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'Eagle effect is seen in \nSelect and explain. \nA. Staphylococcus aureus, B. Enterococcus faecalis, C. Pseudomonas aeruginosa, D. Streptococcus pyogenes', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Some microbes demonstrate a curious response to b-lactam antibiotics known as Eagle-effect. Eagle-effect positive enterococci exhibit their greatest bactericidal response to penicillins at a concentration just above the MIC of the antibiotic, as concentration of P is increased above this value,bactericidal effect against enterococci is decreased. It is their unusual resistance to antibiotics - single outstanding characteristics.', 'role': 'assistant'}]