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: Most people can survive only a few days without water., Fact2: Water is the best fluid for hydration., Question: What can people only survive a few days without? (A) dehydration (B) hydration (C) bacteria (D) sodium (E) food (F) yogurt (G) Chlorophyll (H) oxygen

Ex Output:
B

Ex Input:
Fact1: Biodiversity increases the productivity and stability of ecosystems., Fact2: An ecosystem includes the organisms and their habitat., Question: what does biodiversity increase the productivity and stability of? (A) density (B) the looseness of soil (C) water vapor (D) the environment (E) h2o (F) swamp vegetation (G) biological diversity (H) organisms and their habitat

Ex Output:
H

Ex Input:
Fact1: the color of leaves on deciduous trees usually changes in the autumn season, Fact2: Leaves change color, snow falls, and spring brings back the greenery., Question: what season happens before snow falls, and spring brings back the greenery (A) autumn (B) rainfall (C) Winter (D) H20 (E) spring (F) rain (G) middle (H) summer

Ex Output:
A