Correct Response: B. Antibiotics are a class of drugs that specifically kill bacteria. Because the individual's illness is caused by bacteria growing and multiplying in his body, taking antibiotics is likely to be an effective treatment. Cortisone injections (A) are primarily used to relieve pain and inflammation, not bacterial infections. Some research suggests that certain vitamins (C) may help boost immune system function, but vitamins do not specifically kill bacteria like antibiotics do. Biologic therapies (D) are treatments that use substances produced by the body, such as immune system components, to fight diseases such as cancer. They are not generally used to fight bacterial infections.