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 Input:
Fact1: the emission of sulfur dioxide causes acid rain, Fact2: The sulfur dioxide is converted into sulfuric acid., Question: what causes acid rain? (A) gases (B) rainfall (C) Pollution (D) fossil fuels (E) emissions (F) vehicles (G) burning (H) wind

Ex Output:
E

Ex Input:
Fact1: being distracted while driving can cause people to crash their car, Fact2: Cell phones are a distraction to driving., Question: What can cause people to crash their car? (A) Driving the speed limit (B) energy of moving objects (C) Greenhouse gases (D) Using turn signals (E) fossil fuels (F) smoking cigarettes (G) Keeping their eyes on the road (H) Using a cell phone

Ex Output:
H

Ex Input:
Fact1: harming an animal species causes that animal 's population to decrease, Fact2: Ecology is the study of populations or communities., Question: Ecology studies something that decreases when an animal species is what? (A) omnivores (B) harmed (C) deadly (D) dead (E) haploid (F) negative (G) dormant (H) inactive

Ex Output:
B