Objects in the image:
category: person
category: truck
category: car
category: person
category: train
category: person
category: person
category: person
category: person
category: person
category: person
category: person
category: person
category: bench
category: bus
category: person
category: truck

Guessing-game dialogue about one of the objects:
q: is it person?
a: No
q: train ??
a: No
q: vehicle ??
a: Yes
q: the white van in front?
a: Yes