HLA Testing is used to match organ and tissue transfer receivers
with well-matched benefactors. HLA is a type of blood test done to search for a
protein, which can be found on the exterior of leukocytes or also known as White
Blood Cells. This protein is used to determine the differences between its own
cells and foreign ones, as well as damaging bodies.
Explanation:
it is very important to stay healthy in today's world because if take a good look at this dieses that we see people suffer from its really sad and there is so much different compare to back days those people they made sure that they eat healthy foods that what made them live long
Its got to be B because A is not right all the way and it doesn't provide feedback it would have to make the body do things.