Which of the following statements is not true of cell-mediated immunity ?
  1. it is responsible for type IV hypersensitivity reactions
  2. it defends against parasites
  3. it is important in transplant rejection
  4. it involves predominantly B cells
Explanation
Answer: D - Cell-mediated immunity is a part of the host defense, which involves T lymphocytes, NK cells, and macrophages but is not predominately B-cell mediated.
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