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

Guessing-game dialogue about one of the objects:
q: is it a sign?
a: No
q: is it a person?
a: No
q: is it a vehicle?
a: Yes
q: is it the vehicle behind the guy on the left wearing blue?
a: Yes