Plain English Meaning
The answer options listed under a multiple-choice question — one is right, the rest are wrong but designed to look plausible.
Full Definition
In a multiple-choice test item, the responses are the list of answer choices offered to the test-taker. They consist of one correct answer (the keyed response) and several incorrect answers (the distractors). Together with the stem (the question or incomplete statement), the responses form a complete test item.
Context Anchor
Seen in FAA-style written tests, practice quizzes, and instructor-made questions.
Derivation
Response comes from a Latin word meaning “to answer” or “to reply.” That helps here because each listed choice is a possible answer to the question.
Why Pilots Care
Instructors writing or reviewing test questions need to recognize that the quality of the responses — especially the distractors — determines whether a test item actually measures understanding or just rewards guessing.