Limonene as a xylene substitute can cause what with prolonged exposure?

• A. Sensitization and allergic reactions
• B. No reaction
• C. Hemolysis
• D. Dehydration of tissue

Answer: (A)

Prolonged exposure to limonene, a xylene substitute used in histology, can lead to sensitization and allergic reactions. Limonene itself can oxidize in the air to reactive hydroperoxides that are potent sensitizers, meaning they can trigger immune-mediated skin or respiratory allergic responses after repeated exposure. This is why proper ventilation and personal protective equipment are important when handling limonene-containing agents. The other options don’t fit because hemolysis would involve destruction of red blood cells, and dehydration of tissue isn’t a typical consequence of solvent exposure in this context; the notable risk with limonene is its potential to cause sensitization and allergic reactions.