Uncontrolled production of WBC's results in a disorder called:

Explanation

"Leukaemia" is a type of cancer that results in the body making too many abnormal white blood cells. This uncontrolled production results in an excessive amount of white blood cells that may be immature (acute "leukaemia") or mature (chronic "leukaemia"). "Oedema" is caused by excess fluid becoming trapped in the body's tissues, and this is often caused by fluid leaking from the bloodstream. "Thalassaemia" is the name for a group of inherited conditions that affect a substance in the blood called haemoglobin. People with "thalassaemia" produce either no or too little haemoglobin, which is used by red blood cells to carry oxygen around the body. This can make them very anaemic. "Atherosclerosis" is the thickening or hardening of the arteries caused by a buildup of plaque in the inner lining of an artery. Therefore, A is the correct option.