question: rice:grain
choices.label: A B C D
choices.text: textbook:school television:air conditioner sunshine:rain and dew elephant:animal
explanation: "rice" is a kind of "grain". the teaching tool used by a "school" is a "textbook", and "textbook" corresponds to "school". household appliances include "television" and "air conditioner",and "television" and "air conditioner" are one category. natural phenomena include "sunshine" and "rain and dew", and "sunshine" and "rain and dew" are one category. a "elephant" is a type of "animal".
relation: rice grain R2.2
relation: textbook school R3.10
relation: television air conditioner R2.4
relation: sunshine rain and dew R2.4
relation: elephant animal R2.2