Read this and answer the question. If the question is unanswerable, say "unanswerable".

Crystal Bowersox, who has Type-I diabetes, fell ill due to diabetic ketoacidosis on the morning of the girls performance night for the top 20 week and was hospitalized. The schedule was rearranged so the boys performed first and she could perform the following night instead; she later revealed that Ken Warwick, the show producer, wanted to disqualify her but she begged to be allowed to stay on the show.

Which contestant had to go to the hospital during the week of the top 20?
Crystal Bowersox