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

Guessing-game dialogue about one of the objects:
q: is it the train?
a: No
q: is it part of the train?
a: No
q: is it a sign?
a: No
q: Is it the sign with a 4 on it?
a: No
q: Is there a "9" on it?
a: N/A
q: is it a poll?
a: No
q: is it the green light?
a: Yes