Leukaemia is a type of cancer in which there is abnormal increase in the number of ______

Correct answer: (d) white blood cells

Explanation

Leukaemia is a blood cancer marked by abnormal overproduction of white blood cells (WBCs) in the bone marrow.

These immature blast cells crowd out healthy cells, lowering haemoglobin and platelets.

Symptoms include fatigue, fever and frequent infections.