Step 1: Understanding the Concept:
The question is testing the difference between terms that describe a single drug's concentration behavior and terms that compare two different drug products against each other.
Step 2: Key Fact:
When two products give matching clinical results and matching safety in patients, after being shown to be bioequivalent, they are called therapeutic equivalents. This term is specifically about comparing one drug product to another, often a brand and its generic.
Step 3: Detailed Explanation:
Minimum toxic concentration and minimum effective concentration both describe boundaries of a single drug's own plasma concentration, not a comparison between products.
Therapeutic window is the gap between those two boundaries for one drug, again a single drug property.
None of these three involve comparing two different drugs to each other, so none fit what the question describes.
Step 4: Final Answer:
Two drugs matching in clinical effect and safety are called therapeutic equivalents.