question: pen:stationery:writing
choices.label: A B C D
choices.text: tank:container:hold water clock:time:timekeep grass:plant:feed cattle tile:building material:build wall
explanation: a "pen" is a type of "stationery", and the "pen" is an artificial object; the function of a "pen" is "writing". a "tank" is a kind of "container", and a "tank" is an artificial object, and the function of the "tank" is to "hold water". "clocks" can show "time", a "clock" is not a kind of "time", while the function of a "clock" is "timekeeping". "grass" is a type of "plant". "grass" can be used to "feed cattle", but "grass" is a natural thing, not an artificial thing. "tiles" are a kind of "building material , but "tiles" are used to cover the roof, not "build walls".
relation: clock time R3.10
relation: tile building material R2.2