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: Mammals have a layer of fat under the skin to help insulate the body., Fact2: Glass insulation keeps beverage warm for hours., Question: What keeps mammals warm? (A) evaporation (B) Animal fur (C) staying warm (D) sweating (E) They have thick fur (F) with their fur (G) a layer of fat (H) Veins and arteries.

Ex Output:
G

Ex Input:
Fact1: extreme heat and pressure change rock into metamorphic rock, Fact2: Slate is a metamorphic rock., Question: What rock is formed by extreme heat and pressure (A) erosion (B) crust (C) calcite (D) Slate (E) dead (F) forces (G) fibrous (H) complex

Ex Output:
D

Ex Input:
Fact1: boulders are formed by glaciers melting sometimes, Fact2: Glaciers are made of snow, ice and rock., Question: what melts sometimes to form boulders? (A) snow, ice, and rock (B) precipitation (C) thermal expansion (D) building blocks of organisms (E) rapid changes occur (F) 70-75 degrees Fahrenheit (G) permeable walls (H) holding nutrients

Ex Output:
A