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 canyons are formed by flowing rivers through erosion over long periods of time, Fact2: Canyon formed as a consequence of river erosion., Question: what does erosion form? (A) valleys (B) Sediment (C) mountains (D) canyons (E) soils (F) hills (G) soft soil (H) loose soil

Ex Output:
D


Ex Input:
Fact1: cooking food requires adding heat energy, Fact2: Heat is essentially the source of energy., Question: Doing what to food requires adding the source of energy? (A) burning (B) burying (C) degrading (D) hydration (E) boiling (F) Light (G) sharing (H) cooking

Ex Output:
H


Ex Input:
Fact1: astronauts require preserved food for extended flights, Fact2: Food has been irradiated for our astronauts for over 30 years., Question: what food is required for space travel? (A) hydration (B) humans (C) Energy. (D) irradiated (E) heat energy (F) nutrients (G) Proteins (H) survival

Ex Output:

D