Which description best defines a local effect when exposed to a hazardous substance?

• A. Affects the area at the site of contact only
• B. Affects the entire body
• C. Is delayed for hours
• D. Is independent of contact

Answer: (A)

A local effect means the injury or reaction happens only at the area that has contact with the substance. If a hazardous chemical splashes onto the skin or eyes, the damage—such as irritation or a burn—occurs right there and does not automatically involve the rest of the body. That’s why describing the effect as confined to the site of contact matches the concept of a local effect.

In contrast, effects that involve the whole body are systemic or general effects, not local. If enough chemical is absorbed into the bloodstream, distant organs can be affected. Delayed onset isn’t a defining feature of local effects, and saying the effect is independent of contact contradicts the basic idea that local effects require contact with the substance.