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

Guessing-game dialogue about one of the objects:
q: is it a person?
a: Yes
q: is the person on the right side of the platform?
a: Yes
q: is the person wearing white?
a: No
q: is the person buying tickets?
a: No
q: is the person behind a pole?
a: Yes
q: is it the person between the two poles? near the train door?
a: No
q: it the person behind the person in white that I just asked about?
a: Yes