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

Guessing-game dialogue about one of the objects:
q: is it  person?
a: N/A
q: is it the trolley?
a: No
q: is it a sign?
a: No
q: is it a tree?
a: No
q: is it a building?
a: No
q: is it a person?
a: No
q: is the street?
a: No
q: Is it part of the person?
a: Yes
q: is it the backpack?
a: Yes