Which term is defined as a preventive measure?

• A. Prognosis
• B. Precaution
• C. Rationale
• D. Recur

Answer: (B)

A preventive measure is an action taken to stop harm from occurring before it happens. The term that fits this idea is precaution, because a precaution is something you do in advance to reduce risk or prevent problems. For example, washing hands before eating, wearing a seatbelt, or getting vaccinated are precautions.

Prognosis describes the likely course or outcome of a disease, not an action you take to prevent something. Rationale is the reasoning behind a decision, not a preventive step. Recur means to happen again, which is not about preventing something in advance.