Which irritants may produce systemic toxic effects along with surface irritation such as benzene and carbon tetrachloride?

• A. Secondary irritants
• B. Primary irritants
• C. Local irritants
• D. Systemic irritants

Answer: (A)

Some irritants have dual effects: they irritate the skin or eyes on contact and can also cause systemic toxicity once absorbed. Benzene and carbon tetrachloride are classic examples—they can irritate surfaces but also produce systemic harm (benzene affecting the blood-forming system, carbon tetrachloride harming the liver). This dual action defines secondary irritants. The other categories describe either primarily local effects (local/primary irritants) or systemic effects without surface irritation (systemic irritants), so they don’t capture the combination described. Therefore, secondary irritants are the best fit.