Objects in the image:
category: person
category: person
category: train
category: train
category: person
category: person
category: person
category: person
category: person
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 a train?
a: Yes
q: The green one?
a: Yes