问题
单项选择题
A client who agreed to become an organ donor is pronounced dead. What is the most important factor in selecting a transplant recipient ？（）
A．Blood relationship.
B．Sex and size.
C．Compatible blood and tissue types.
D．Need.
答案
参考答案：C
解析：
The donor and recipient must have compatible blood and tissue types. They should be fairly close in size and age. When a living donor is considered, it's preferable to have a relative donate the organ. Need is important, but it can't be the critical factor if a compatible donor isn't available.