Answer is : (a) kidney
Haemodialysis is a process of purifying the blood of a person whose kidneys are not working normally. It helps to filter waste, removes extra fluid and balances electrolytes (sodium, potassium, bicarbonate, chloride, calcium, magnesium and phosphate). During haemodialysis, blood is removed from the body and filtered through a man-made membrane called a dialyser, or artificial kidney and then the filtered blood is returned to the body.
