In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

[EX Q]: Fact1: condensing means changing from a gas into a liquid by reducing heat energy, Fact2: Heat energy is measured in calories., Question: Calories measure the energy that leaves a gas to form what? (A) nutrients (B) burning (C) warmth (D) H20 (E) ligt (F) liquid (G) store (H) movement
[EX A]: F

[EX Q]: Fact1: Most amphibians breathe with gills as larvae and with lungs as adults., Fact2: All frogs are amphibians., Question: What do frogs breathe with when they are adults? (A) skin (B) fins (C) lungs (D) oxygen (E) gills (F) air (G) Energy (H) Gases
[EX A]: C

[EX Q]: Fact1: most canyons are formed by flowing rivers through erosion over long periods of time, Fact2: Most river erosion occurs when the river is in flood., Question: what are most canyons formed by over long periods of time? (A) hurricanes (B) wind tunnels (C) dangerous (D) forces (E) kalenchoes (F) flooding (G) high populations (H) Sediment
[EX A]:
F