NID's 2027–28 official announcement page checked for this update did not announce an answer key, response-sheet release or challenge window. NID may publish stage-specific instructions after an examination; rely on the candidate portal and official notices rather than assuming a key or objection facility will be provided.

If NID publishes a key or response sheet

1. Sign in through the official portal and download the document for the correct programme and stage.
2. Compare the recorded responses with the released key and note any specific discrepancy.
3. If a challenge facility is officially opened, submit the question/response reference and supporting evidence using the prescribed form before the deadline.
4. Pay a challenge fee only if the official notice requires it, and save the receipt and acknowledgement.
5. Check the final key or subsequent result notice; the decision and schedule are governed by NID's published rules.

Do not treat unofficial coaching keys as final or assume every DAT component has an objective answer key. Legacy content at /en/nid-answer-key relates to an earlier admission cycle and is retained only as historical context.