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: mechanical weathering is when rocks are broken down by mechanical means, Fact2: Water is a mechanical weathering force., Question: What weathers rocks? (A) soil (B) streams (C) a delta (D) calcite (E) erosion (F) water (G) grass (H) the sun

Ex Output:
F

Ex Input:
Fact1: an animal usually requires a warm body temperature for survival, Fact2: Squirrels hide and sleep in a secret warm place all winter., Question: What requires hiding and sleeping for survival? (A) bacteria (B) rice (C) amphibians (D) organisms (E) Frogs (F) trees (G) humans (H) animals

Ex Output:
H

Ex Input:
Fact1: planting trees has a positive impact on an ecosystem, Fact2: Destruction of Trees is taking place, pollution of air is the Result of cutting trees with pace., Question: What has a positive effect on an ecosystem? (A) maintaining air pollution (B) removing habitats (C) stopping air pollution (D) to stay warm (E) in the frog family (F) Electric generators (G) increasing air pollution (H) genetic diversity

Ex Output:
C