'Triclosan', considered harmful when exposed to high levels for a long time, is most likely present in which of the following?

1. A

   Food preservatives

   Food preservatives. Not the main listed use.

2. B

   Fruit-ripening substances

   Fruit-ripening. That is ethylene / carbide.

3. C

   Reused plastic containers

   Reused plastic. Not a triclosan story.

4. D

   Toiletries

   Toiletries. Antibacterial soaps, toothpastes, some cosmetics.

Summary. Official key is (d) toiletries. Triclosan was widely added to soaps, toothpastes and other personal-care products; long high exposure is the toxicology worry.