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

Guessing-game dialogue about one of the objects:
q: is it red?
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 vehicle?
a: Yes
q: is it the vehicle to the left of the firetrucks?
a: Yes