When used as hypnotics, some barbiturates lose their effectiveness after ____ of regular use
a. two weeks c. three days
b. three months d. six months
ANS: A
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A Correct: According to research, two weeks is the maximum effectiveness for some barbiturates.
B Incorrect: This is not a true time frame.
C Incorrect: This is not a true time frame.
D Incorrect: This is not a true time frame.
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