A 56-year-old homeless, alcoholic, and febrile man is brought to the emergency department after a

A 56-year-old homeless, alcoholic, and febrile man is brought to the emergency department after a difficult night during which his coughing kept everyone at the shelter awake. On arrival his pulse is rapid, and his breathing is labored with diffuse rales. Endotracheal aspirates produce a mucopurulent discharge containing numerous gram-positive cocci in chains. His serum contains high titers of IgM antibodies specific for the polysaccharide capsule of Streptococcus pneumoniae. The effector mechanism most likely to act in concert with this early IgM production to clear infection is: (A) ADCC (B) complement-mediated opsonization (C) cytotoxic T lymphocytes (D) LAK cells (E) NK cells

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