Drug addiction occurs when:

A. an individual will lie about taking a drug.
B. a drug no longer causes a person to get high, but they take it again.
C. biological or psychological dependence on taking the drug develops.
D. a person can be without the drug no longer than five days.

C. biological or psychological dependence on taking the drug develops.

Right.

The answer is C. biological or psychological dependence on taking the drug develops.

To arrive at this answer, let's break down the options:

A. an individual will lie about taking a drug - While lying about taking a drug can be a sign of addiction, it does not encompass the entire concept of addiction. Many people struggling with addiction may lie about their drug use, but this alone does not define addiction.

B. a drug no longer causes a person to get high, but they take it again - This scenario may indicate tolerance, where the body has adapted to the drug and requires higher doses to achieve the desired effect. However, tolerance alone does not necessarily mean addiction. Addiction involves a complex combination of factors, including both physical and psychological dependence.

C. biological or psychological dependence on taking the drug develops - This option accurately describes a key characteristic of addiction. Biological dependence refers to the body adapting to the presence of a drug, leading to physical withdrawal symptoms when the drug is removed. Psychological dependence refers to the emotional and mental reliance on the drug to feel normal or cope with life's challenges. Both aspects contribute to addiction.

D. a person can be without the drug no longer than five days - This option does not relate directly to addiction. It implies a specific timeframe but does not address the underlying factors that define addiction.

Therefore, the correct answer is C. biological or psychological dependence on taking the drug develops.