Correct Answer: White Blood Cells

Solution : The correct answer is White Blood Cells.

White blood cells play a crucial role in the immune system, aiding the body's defence against disease. However, in leukaemia patients, the bone marrow produces an excessively high quantity of immature white blood cells, which carry their proper functions. Red blood cells, and platelets, two types of healthy blood cells, may be displaced by these aberrant white blood cells. Numerous problems may arise from this, such as an elevated risk of infection, anaemia (low red blood cell count), and easy bleeding (low platelet count).