Last question answer - Neutrophil., Diagnosis - Acute Bacterial Pneumonia.

An experiment isolates peripheral blood cells into a culture medium that preserves their metabolic activity. After interferon-γ is added to this culture, the cells are incubated. Next, a cell-free supernatant from this culture is added to a second culture medium containing Escherichia coli organisms. Which of the following cell types is the most likely source for observed bactericidal activity against E. coli

□ (A) Basophil
□ (B) B lymphocyte
□ (C) CD4 lymphocyte
□ (D) Macrophage

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