Objects in the image:
category: person
category: person
category: person
category: chair
category: person
category: tennis racket
category: person
category: person
category: chair
category: person
category: person
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 it one of the players?
a: No
q: is it the ref on the right, sitting?
a: Yes