At this point in time only one Answer key has been released and it is by Brilliant Study centre. NTA will release the provisional and official answer keys in a week's time. But for now, Brilliant Study centre has released the Answer key and you can check that at: https://medicine.careers360.com/articles/neet-answer-key . In a couple of days, other Institutions also will release their Answer keys and you can check them at our page: https://www.google.com/amp/s/medicine.careers360.com/articles/neet-answer-key/amp