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

Guessing-game dialogue about one of the objects:
q: is it a person?
a: Yes
q: is it the boy on surfboard?
a: No
q: is it the girl?
a: No
q: is it one of 2 persons standing at back?
a: No
q: is it the one swimming near boy?
a: Yes