What is referred to as the "key" in a multiple-choice question?

The term "key" in the context of a multiple-choice question specifically refers to the correct answer of that question. In assessment practices, identifying the key is crucial as it serves as the reference point for evaluation. When a test-taker selects the key, it indicates their understanding or knowledge of the subject matter being tested. This terminology is widely used in educational and examination settings to facilitate clear communication about which answer is deemed correct. Responses are often graded against this key to determine overall performance and comprehension of the material.