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

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