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: when a metal rusts , that metal becomes orange on the surface, Fact2: Iron rusts in the presence of oxygen and water., Question: Exposure to oxygen and water can cause iron to (A) decrease strength (B) melt (C) uncontrollable burning (D) thermal expansion (E) turn orange on the surface (F) vibrate (G) Extremes of temperature (H) levitate
[EX A]: E

[EX Q]: Fact1: astronauts require preserved food for extended flights, Fact2: An astronaut is a scientist who is a space explorer., Question: Space explorers require preserved foods for (A) ground training (B) nutrients (C) Dehydration (D) survival (E) long flights (F) short flights (G) Special disposal (H) day trips
[EX A]: E

[EX Q]: Fact1: gases released during the use of fossil fuels causes global warming, Fact2: Sea level rise is caused by global warming and the fastest growing source is air traffic., Question: What do fossil fuel gases cause? (A) Extra money (B) Sea level rise (C) forest is destroyed (D) Mining opportunity (E) population movement (F) Dehydration (G) deforestation (H) oxygen
[EX A]:
B