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

Guessing-game dialogue about one of the objects:
q: is it a person?
a: No
q: is it in the left half of the image?
a: No
q: is it red?
a: No
q: is it the trolley?
a: N/A
q: is it to the right of the trolley?
a: N/A
q: Is it a bag on the trolley?
a: Yes
q: is it blue?
a: Yes