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

Guessing-game dialogue about one of the objects:
q: is it a person?
a: N/A
q: is it in the background?
a: No
q: is it white?
a: No
q: is it rock?
a: No
q: is it grey?
a: No
q: is it green?
a: No
q: is someone touching it?
a: Yes
q: is someone riding it?
a: No
q: is it on someones back?
a: Yes
q: is it on one of the two people in the middle?
a: Yes
q: is it on the person wearing yellow?
a: No