Objects in the image:
category: person
category: chair
category: bench
category: sports ball
category: backpack
category: tennis racket
category: person
category: tennis racket

Guessing-game dialogue about one of the objects:
q: is it person?
a: No
q: is it ball?
a: No
q: is it bench?
a: No
q: is it racket?
a: Yes
q: the one in front?
a: No
q: the one in back court?
a: Yes