Objects in the image:
category: cell phone
category: person
category: backpack
category: backpack
category: person
category: person
category: person
category: person
category: person
category: tie
category: bicycle
category: person

Guessing-game dialogue about one of the objects:
q: Is it a sign?
a: No
q: is it a person?
a: No
q: Can you wear it?
a: No
q: Is it a backpack?
a: Yes
q: Is it the black backpack in the front?
a: Yes