$8$

Multiple Choice $1\mathrm{.}33$ points

Which sentence is true, which is false?

In graft$-$versus$-$host disease the cells of the recipient patient attack and destroy the bone marrow donor cells. In organ transplant rejection the cells of $t$ e donor organ attack and destroy recipient patient tissues.

Both sentences are true

Sentence $1$ is true; sentence $2$ is false

Sentence $1$ is false; sentence $2$ is true

Both sentences are false