Yes, NTA gives candidates the opportunity to challenge the released provisional answer key, in case they find any discrepancy in it. This provision can be availed only for 2-3 days.
To challenge the answer key, you’ll have to pay a fee of INR 200 per answer challenged (refundable if correct), and also follow certain steps.
To know how to challenge the UGC NET answer key, you can read about it in the article above.