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

Guessing-game dialogue about one of the objects:
q: person ??
a: No
q: skateboard ??
a: Yes
q: is it the guy jumping in the middle?
a: Yes