Which of the Following Statements Best Describes the Term "Drug

Which of the following statements best describes the term "drug toxicity"?

A) It refers to the effects of drugs that interfere with normal functioning in such a way as to produce dangerous or potentially dangerous consequences.
B) It refers to a phenomenon seen with many drugs, in which repeated exposure to the same dose of the drug results in a lesser effect.
C) It refers to the use of prescribed drugs in greater amounts than, or for purposes other than, those prescribed by a physician or dentist.
D) It refers to a state in which the individual uses the drug so frequently and consistently that it appears that it would be difficult for the person to get along without using the drug.