A type of cancer of the blood or bone marrow characterized by the uncontrolled production of abnormal white blood cells.

• A. Lymphoma
• B. Leukemia
• C. Myeloma
• D. Anemia

Answer: (B)

This describes leukemia, a cancer of the blood or bone marrow in which abnormal white blood cells are produced uncontrollably. The marrow churns out these dysfunctional white cells, which crowd out normal blood cells and can’t fight infections effectively. That crowding leads to symptoms like frequent infections, fatigue from anemia, and easy bruising or bleeding due to impaired blood cell production. Leukemia can be acute or chronic and involves different cell lineages (lymphoid or myeloid), affecting how it behaves and is treated. Other options reflect different conditions: lymphoma is cancer of the lymphatic system, myeloma is cancer of plasma cells in the bone marrow, and anemia is a shortage of red blood cells—not a cancer of white cells.