The best explanation for Chris's lack of a rash from the water was that his prescription has an antagonistic relationship with the toxin in the water. Option B would be that.
Drug-drug interaction is determined by the relationship that develops between two drugs when they are administered concurrently or concurrent.
An antagonistic relationship is a relationship that exists between two drugs that have opposing impact on the body.
Here, Chris's medication has an antagonistic relationship with the toxin in the water.
Thus, the correct option is B.
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