Objects in the image:
category: person
category: bench
category: backpack

Guessing-game dialogue about one of the objects:
q: Is it a person?
a: No
q: Is it in front of the railing?
a: Yes
q: Is it behind the person?
a: No
q: Is it the garbage can?
a: No
q: Is it the railing?
a: No
q: Is it the blue bag?
a: Yes