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

Guessing-game dialogue about one of the objects:
q: is it a person?
a: No
q: is it the vehicle?
a: Yes
q: the yellow colour?
a: No
q: the whole police van?
a: Yes