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: a flashlight requires a source of electricity to produce light, Fact2: Flashlights can help children see better., Question: Children see better with a source of electricity to do what? (A) focusing a lens (B) staying warm (C) survival (D) reproduce (E) produce light (F) remove electricity (G) produce darkness (H) remove light

Ex Output:
E

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: Roots grow in length and width from primary and secondary meristem., Fact2: E.g., growth in plants is mostly confined to meristems., Question: what have roots? (A) plants (B) fungi (C) cacti (D) clothing (E) density (F) grass (G) Conifers (H) h2o

Ex Output:
A