Layla is helping to clean car parts with a single chemical, but it isn't working. She washes her hands and tries a different chemical, which also does not work. She resumes with the first chemical without washing her hands. This time, the cleaning process works, but she begins to get dizzy and nauseated. What can Layla infer about the possible reason for her illness?

It is an acute effect of two toxins with a synergistic relationship.
It is a chronic effect of the second toxin she used to clean the parts.
The first chemical has an antagonistic relationship with the second.
The second chemical causes acute affects, and the first causes chronic affects.