Which of the following substances could potentially cause reversible effects when exposed to toxicants?

Hepatotoxic substances are known to cause damage to the liver and can lead to reversible effects when the exposure is eliminated or reduced. The liver has a remarkable ability to regenerate and recover from certain types of injury, especially in the case of acute toxic insults. This regenerative capacity means that the liver can often return to its normal function after the removal of the toxicant, provided the damage is not severe or chronic.

On the other hand, the other categories of substances have more permanent implications. Mutagenic agents can cause irreversible changes to DNA, potentially leading to long-lasting genetic effects. Teratogenic substances can cause permanent fetal malformations during development, and carcinogenic substances are linked to the development of cancer, which is typically irreversible. Hence, while hepatotoxic agents can demonstrate reversible effects following exposure, the other categories generally involve changes or damage that are not reversible.