Type D (delayed) reactions take time to develop.

Type D (delayed) reactions take time to develop.

• A. Take time to develop
• B. Immediate
• C. Dose-dependent
• D. Reversible

Answer: (A)

Type D reactions are defined by a delayed onset after exposure to a drug, meaning there is a latency period before symptoms appear. This delay can span months or even years and, in some cases, symptoms may emerge after the drug is stopped due to cumulative or long-term effects. That makes the idea that these reactions “take time to develop” the best fit. Immediate reactions show up right away, so they don’t describe Type D. Dose dependence and reversibility aren’t defining features of delayed reactions, though some cases may involve those aspects; the key point is the time gap between exposure and onset.

Type D reactions are defined by a delayed onset after exposure to a drug, meaning there is a latency period before symptoms appear. This delay can span months or even years and, in some cases, symptoms may emerge after the drug is stopped due to cumulative or long-term effects. That makes the idea that these reactions “take time to develop” the best fit. Immediate reactions show up right away, so they don’t describe Type D. Dose dependence and reversibility aren’t defining features of delayed reactions, though some cases may involve those aspects; the key point is the time gap between exposure and onset.