Objects in the image:
category: person
category: bench
category: backpack
category: person
category: backpack
category: surfboard
category: surfboard
category: bench
category: person
category: surfboard
category: surfboard
category: surfboard
category: backpack
category: surfboard
category: person
category: bench
category: person

Guessing-game dialogue about one of the objects:
q: a board ??
a: No
q: person  ??
a: No
q: Is it the bench?
a: No
q: table ??
a: No
q: backpack  ??
a: Yes
q: The grey one on the table?
a: Yes