Select the option that is related to the third word in the same way as the second word is related to the first word.

Angioplasty : Heart :: Dialysis : ?

Kidney

Angioplasty : Heart

The logic followed here is :

Angioplasty is the treatment of  unblocking of blood vessels especially in a coronary artery , which is in heart

Dialysis : Kidney

Dialysis is the process of removing waste products and excess fluid from body, this process is necessary when the kidneys are functioning