Find one odd word A, B, C or D

. Find one odd word A, B, C or D.
1. A. volumeB. mandolinC. harmonicaD. saxophone
2. A. singerB. actorC. artistD. teacher
3. A. popB. rockC. songD. opera
4. A. musicB. scienceC. filmD. art
5. A. paintingB. artistC. exhibitionD. rappe