Cornea transplant in humans is almost never rejected. This is because

Options

(a) Its cells are least penetrable  by bacteria
(b) it has no blood supply
(c) it is composed of enucleated cells
(d) it is a non-living layer

Correct Answer:

it has no blood supply

Explanation:

Cornea transplant in humans is almost never rejected. This is because it has no blood supply. Cornea is a transparent layer of tissue, continuous with the sclerotic, that forms the front part of the vertebrate eye, over the iris and lens.