noun
Used in surveys, tests, or forms where only one answer is allowed, as opposed to multiple-answer formats. Often contrasted with 複数回答.
See also: 単一回答
このアンケートは単回答形式です。
This survey uses a single-answer format.
単回答の質問では、最も当てはまるものを一つ選んでください。
For single-answer questions, please choose the one that applies most.
Synonym; 単一回答 is a more formal or technical variant of 単回答.
Compound of 単 (single) + 回答 (answer). The exact origin is uncertain, but it follows a common pattern for technical terms in surveys and testing.