________ occurs because of the diminished response of the nervous system to a drug and the requirement of higher doses of the drug to achieve the desired effect.
a. Dependence
b. Tolerance
c. Abstinence
d. Admittance
Question 2
According to the World Health Organization (WHO), drug abuse refers to the ________.
a. excessive use of a drug in a way that is inconsistent with medical practice
b. mental or physical craving for a drug and withdrawal symptoms when use of the drug is stopped
c. physical dependence on a drug
d. tolerance built up to a particular drug