单选题 A client has just finished his glucose tolerance test. How many hours should it take for his blood glucose level to return to normal?
A. 2 hours.
B. 3 hours.
C. 5 hours.
D. 6 hours.

【正确答案】 B

【答案解析】The blood glucose level should return to normal within 3 hours. Some hypoglycemia (a less than normal amount of glucose in the blood) within this time can be expected without causing problems.