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

Guessing-game dialogue about one of the objects:
q: is it a person?
a: No
q: is it a vehicle?
a: No
q: is it a tree?
a: No
q: is it on a person?
a: Yes
q: is it the red backpack on the person on the left?
a: No
q: is it a backpack?
a: Yes
q: in that group in front of the bus is it on the left most person?
a: Yes