After inhaling an airborne white powder, a victim reports feeling unwell days later; this observation would indicate a biological agent.

• A. Not enough information
• B. Irrelevant
• C. True
• D. False

Answer: (C)

A key idea here is how illnesses show up after exposure. Biological agents often don’t cause symptoms right away—their incubation period allows time for the agent to multiply in the body before illness becomes noticeable. If someone inhaled a white powder and only days later feels unwell, that delayed onset fits what we expect from a biological threat rather than a typical chemical exposure, which usually produces symptoms more quickly. So this observation supports suspecting a biological agent, making the statement true. While not every delayed case is biological, the timing is a strong clue used in hazmat assessment.