Objects in the image:
category: person
category: car
category: traffic light
category: car
category: car
category: person
category: car
category: person
category: person
category: person
category: car
category: backpack
category: truck
category: traffic light
category: backpack
category: person

Guessing-game dialogue about one of the objects:
q: is it a vehicle?
a: No
q: is it a person?
a: No
q: is it a building?
a: No
q: is it a sign?
a: No
q: is it a light post?
a: No
q: is it something a person is wearing or holding?
a: Yes
q: Is it a backpack?
a: Yes