Why is tissue typing necessary before a kidney transplant?
to determine the compatibility of the blood types of donor and recipient
to determine the compatibility of the organs of donor and recipient
to determine the compatibility of antibodies of donor and recipient
to determine the compatibility of the blood vessels of donor and recipient

The correct answer is (b) to find the compatibility between the organs of donor and recipient.

Tissue typing is the second test in the series of tests that has to be done before kidney transplant. This is a type of blood test in which the matching of antigens is done between the receptor and donor. These antigens can help to know the similarity of body tissue between the donor and the recipient. Each person has six types of tissue typing antigen and the 6/6 matching says that the organ is compatible for transplant between the donor and the recipient.