单选题 The nurse is preparing to administer a unit of blood to a client who is anemic. After its removal from the refrigerator, the blood should be administered within
A. 1 hour.
B. 2 hours.
C. 4 hours.
D. 6 hours.

【正确答案】 C

【答案解析】After the blood is removed from the refrigerator, it must be administered within 4 hours. Refrigeration delays the growth of bacteria in the blood. Options A and B are incorrect because the client could experience fluid overload if the blood is administered too rapidly. Option D is incorrect because of the extended time out of refrigeration and risk of contamination and growth of bacteria.