B-cells are:
  1. Antibody-producing plasma cells
  2. Antihistamine-producing cells
  3. Leukocyte-producing cells
  4. Neutropenia cells
Explanation
Answer: A - B-cells are antibody-producing plasma cells. These mature white blood cells have left the bone marrow and migrated to the lymphoid organs. The plasma cells will begin to synthesize antibodies.
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