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

Guessing-game dialogue about one of the objects:
q: is it a person?
a: No
q: is it the big truck?
a: No
q: is it part of the truck?
a: No
q: is it something a person is wearing?
a: Yes
q: is it a backpack?
a: Yes
q: is it gray with a yellow dot in the middle?
a: Yes