question: rainstorm:flood:drainage
choices.label: A B C D
choices.text: heat:drought:reduction of production slippery road:fall:crying holidays:congestion:evacuation earthquake:casualty:rescue
explanation: "rainstorm" will lead to "flood", and "drainage" is required after the occurrence of "flood", and "rainstorm" is a natural phenomenon. "heat" will lead to "drought", and "drought" will lead to "reduction of production", and "heat" is a natural phenomenon, which is inconsistent with the logic of the topic. "slippery road" will lead to "falling", and "crying" may occur after falling, instead of "crying". "holidays" may lead to "congestion", and "evacuation" is required after "congestion", and "holidays" are not a natural phenomenon. "earthquake" will cause "casualties", and "rescue" is needed after the occurrence of "casualties", and "earthquake" is a natural phenomenon.
relation: rainstorm flood R5.1
relation: flood drainage R3.10
relation: heat drought R5.1
relation: drought reduction of production R5.1
relation: slippery road fall R5.1
relation: holidays congestion R5.1
relation: congestion evacuation R5.1
relation: earthquake casualty R5.1
relation: casualty rescue R3.10