In terms of organ systems impacted by toxins, which pairing is incorrect?

The dermal system, which refers to the skin and its associated components, typically does not have a strong or direct link to the impacts of organic solvents and nickel in the way the other systems do with their respective toxins. While organic solvents can cause irritation to the skin and nickel can lead to dermatitis, the primary effects of these substances are not centered around the dermal system in a significant way compared to their impact on other organ systems.

For instance, organic solvents are more notorious for affecting the central nervous system, often leading to various neurological symptoms. Nickel is primarily recognized for its systemic effects when it causes allergic reactions or respiratory issues rather than mainly affecting the skin. In contrast, the other pairings highlight toxins that are well-known for their adverse effects on the specified organ systems, such as heavy metals affecting cardiovascular health and solvents impacting the central nervous system. This establishes a clear contrast in the degree of impact that each listed pairing has on their respective systems.