Auto-detected: numbered questions (1., 1), Q1, Question 1, [1]), “Question:” blocks, or unnumbered questions separated by blank lines.

Five options: A. / A) / (A) / [A] / A text; 1–5; or five bullet lines. Lettered options can be lowercase.

Correct answers: ✅ / ✓ / ✔ / (correct) / [correct] on an option, or an Answer, Correct answer, Ans, or Key line. Keys can be letters, 1–5, or the exact option text.

Question: Which number is prime?
- 4
- 6
- 7 ✓
- 8
- 9
Reason: 7 has exactly two positive divisors.

Explanation, Rationale, Reason, Reasoning, and Solution labels are accepted. Markdown headings, SECTION headers, code fences and AUDIT SUMMARY footers are handled. Paired **, ___ and ~~ formatting is cleaned. Missing explanations are reported; conflicting or unclear answers block import so you can fix them.

Keep each option on its own line. This is format detection, not AI: it never guesses the right answer. Review the import preview before starting. Results show original labels for explanations that refer to options.