A college professor's work performance recently has deteriorated, and his colleagues find him difficult to talk to. If this is due to a problem with drugs, the best description of this professor's behavior would be:

A college professor's work performance recently has deteriorated, and his colleagues find him difficult to talk to. If this is due to a problem with drugs, the best description of this professor's behavior would be:

• A. Substance intoxication
• B. Withdrawal
• C. Tolerance
• D. Substance use disorder

Answer: (D)

This item tests recognizing a pattern of problematic drug use that causes ongoing impairment in multiple areas of life. The professor’s deteriorated work performance and difficulty talking to colleagues imply persistent social and occupational problems from drug use, which fits a substance use disorder—a pattern of use that leads to significant impairment or distress over time. Distinguishing it from the other options: substance intoxication describes the acute effects while actively using, not a chronic pattern of impairment; withdrawal is the state after stopping use and has its own symptoms; tolerance is needing more of the drug to achieve the same effect, which by itself doesn’t specify ongoing impairment. The ongoing impairment across work and social interaction aligns with substance use disorder.

This item tests recognizing a pattern of problematic drug use that causes ongoing impairment in multiple areas of life. The professor’s deteriorated work performance and difficulty talking to colleagues imply persistent social and occupational problems from drug use, which fits a substance use disorder—a pattern of use that leads to significant impairment or distress over time.

Distinguishing it from the other options: substance intoxication describes the acute effects while actively using, not a chronic pattern of impairment; withdrawal is the state after stopping use and has its own symptoms; tolerance is needing more of the drug to achieve the same effect, which by itself doesn’t specify ongoing impairment. The ongoing impairment across work and social interaction aligns with substance use disorder.