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: seeing requires light, Fact2: Vision is our ability to see., Question: What is required for vision? (A) light (B) goggles (C) food (D) smell (E) hormones (F) Protein (G) color (H) hue

Ex Output:
A


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: Plants that shed their leaves seasonally each year are called deciduous plants., Fact2: Bog birch is a deciduous shrub., Question: what sheds its leaves seasonally? (A) bog birches (B) it needs them (C) When it's cold (D) Most plants (E) grass (F) swamp vegetation (G) insects (H) h2o

Ex Output:

A