Objects in the image:
category: backpack
category: person
category: bottle
category: tennis racket
category: chair
category: bottle
category: person
category: person

Guessing-game dialogue about one of the objects:
q: person ??
a: No
q: racket ??
a: No
q: bag ??
a: No
q: What is an official ball?
a: No
q: towel ??
a: No
q: water bottle?
a: Yes
q: red cap?
a: Yes
q: between the guys legs on the left?
a: Yes