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

Guessing-game dialogue about one of the objects:
q: is it blue?
a: Yes
q: is it a person?
a: Yes
q: can you see the persons head?
a: No
q: is it the person in the very back seat?
a: Yes
q: is it the shirt blue and white?
a: Yes