How to Answer SBA Questions

A repeatable technique for the single best answer format

Why technique matters

Single best answer (SBA) questions reward more than raw knowledge. Two students with the same revision can score very differently depending on how they read the question, handle uncertainty and manage their time. A consistent method turns a panicky guess into a reasoned choice, and over a long paper those marginal gains add up.

Read the question before the options

Resist the urge to jump to the answer list. Read the stem fully and, before looking at the options, try to predict the answer in your head. If your prediction is sitting there in the list, that is a strong signal. Predicting first stops the well-written distractors from leading you astray.

Find the lead-in and the discriminator

The final sentence, the lead-in, tells you exactly what is being asked: the most likely diagnosis, the single most appropriate next investigation, the best initial management. A question can give a classic disease but then ask for the investigation, not the diagnosis. Identify the one detail that separates the options, the discriminator, such as a timeframe, an age, or a single examination finding.

Worked logic: "Most appropriate initial investigation" is different from "most definitive investigation". An abdominal ultrasound may be the right first step even when CT is the gold standard. Always answer the question that was actually asked.

Use the options actively

Eliminate options you can confidently exclude, which raises your odds even when you are unsure. Watch for two options that are exact opposites, as the answer is often one of them, and for an option that is true in general but does not fit this specific patient.

Common traps to avoid

  • The longest option: length is not a clue. Examiners know students pick the most detailed answer, so do not be swayed by it.
  • Absolute words: options containing "always" or "never" are more often wrong, but treat this as a weak hint, not a rule.
  • Knowledge you brought, not facts you were given: answer from the information in the stem, not from an assumption the question never stated.
  • Changing answers late: only change a first instinct if you can articulate a concrete reason, not on a vague feeling.

Pace and flagging

Work out your time per question and keep moving. If a question is taking too long, pick your best current answer, flag it, and return later with fresh eyes. A blank is always wrong, so never leave one unanswered when there is no negative marking.

Learn from every question

The real value of practising SBAs is in the review. For each one you get wrong, read why every option was right or wrong, not just the correct letter. Practising questions and reviewing the explanations is active recall, which transfers to the exam far better than re-reading notes.