What is a Single Best Answer question?
A Single Best Answer (SBA) question is a form of multiple-choice question used widely in medical, legal and professional exams. It presents a realistic scenario — the stem — followed by a focused question — the lead-in — and a set of options where every option is plausible, but one is the single best answer rather than the only correct one.
This is what separates a well-written SBA from a basic multiple-choice question: the distractors are all defensible, so the candidate has to reason about which option is most appropriate. That makes SBAs a rigorous, efficient way to test applied knowledge that can still be marked objectively and instantly.
Why it matters
Because SBAs are auto-marked, they scale to large cohorts while remaining consistent and defensible. Paired with item statistics — such as item difficulty and discrimination — they let assessment teams build banks of questions that are proven to work.
Synap supports proper SBA structure (separated stem and lead-in, option-level feedback) as part of its standardised testing toolkit.