Objects in the image:
category: car
category: bus
category: person
category: car
category: bus
category: bus
category: car
category: car
category: car

Guessing-game dialogue about one of the objects:
q: is it a vehicle?
a: Yes
q: bus ??
a: No
q: is it a black car?
a: No
q: the car next to the nearest bus?
a: No
q: gray car? ?
a: Yes
q: Is it a grey car going uphill?
a: Yes