54 year-old homeless man has a chronic cough, a cavitary lesion of the lung, and is sputum positive for acid-fast bacilli. Which of the following is the principle form of defense by which the patient's body fights this infection?
A. Antibody-mediated phagocytosis
B. Cell-mediated immunity
C. IgA-mediated hypersensitivity
D. IgE-mediated hypersensitivity
E. Neutrophil ingestion of bacteria
A. Antibody-mediated phagocytosis
B. Cell-mediated immunity
C. IgA-mediated hypersensitivity
D. IgE-mediated hypersensitivity
E. Neutrophil ingestion of bacteria