question: flood:drought:flood and drought control
choices.label: A B C D
choices.text: earthquake:tsunami:earthquake relief landslide:avalanche:road repair severe cold:extreme heat:antifreeze to cool off the heat sandstorm:smog:sand control and haze removal
explanation: "flood" and "drought" have opposite meanings. flood is the opposite to dry, and waterlog is the opposite to drought. natural disasters include "earthquakes" and "tsunamis". "earthquake" and "tsunami" do not have opposite meanings. natural disasters include "landslide" and "avalanche", and "landslide" and "avalanche" do not have opposite meanings. "severe cold" and "extreme heat" have opposite meanings. severe corresponds to extreme and cold corresponds to heat. natural disasters include "sandstorm" and "smog", and "sandstorm" and "smog" do not have opposite meanings.
relation: flood drought R1.2
relation: severe cold extreme heat R1.2