Irritates living tissue on contact.

• A. Corrosive
• B. Flammable
• C. Irritant
• D. Oxidizer

Answer: (C)

Understanding how chemicals interact with living tissue helps you pick the right hazard label. An irritant is a substance that, on contact, causes a reversible inflammatory response in skin, eyes, or mucous membranes—things like redness, itching, or mild pain—without necessarily causing permanent damage. That’s exactly what “Irritates living tissue on contact” describes, so this is the best match.

A corrosive substance, by contrast, damages or destroys tissue on contact, potentially causing chemical burns. A flammable substance is defined by its tendency to catch fire or support combustion, not by tissue irritation. An oxidizer is reactive and can intensify fires, or cause burns through its strong reactivity, but again that description doesn’t focus on irritation of living tissue.

So the statement points to an irritant, not a corrosive, flammable, or oxidizing hazard.