Objects in the image:
category: person
category: skateboard
category: backpack
category: person
category: person

Guessing-game dialogue about one of the objects:
q: is that related to person?
a: Yes
q: is that related to person in front?
a: Yes
q: is that related to his guards?
a: No
q: is that related to his skateboard?
a: Yes
q: is that complete skate board?
a: No
q: is that its wheels?
a: No
q: is that its axle?
a: No
q: is that the board?
a: Yes