Objects in the image:
category: sports ball
category: person
category: tennis racket

Guessing-game dialogue about one of the objects:
q: is it green?
a: No
q: is it the net?
a: No
q: is it on the person?
a: No
q: is it the racket?
a: No
q: is it on the top of the picture?
a: No
q: is it near the person's knee?
a: No
q: is it the person?
a: Yes