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

Guessing-game dialogue about one of the objects:
q: Is it a person?
a: Yes
q: is he in red?
a: Yes
q: is he the one hitting the tennis ball?
a: Yes