Objects in the image:
category: vase
category: person
category: knife
category: potted plant

Guessing-game dialogue about one of the objects:
q: is it a person?
a: No
q: is it white?
a: No
q: is it in the background?
a: No
q: is it the brownish towel on the table?
a: No
q: the table itself?
a: No
q: the brown stain?
a: No
q: knife . ..?
a: Yes