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: Mutations are essential for evolution to occur., Fact2: Mutations are changes in the DNA sequence., Question: What is essential for evolution to occur? (A) Changes in DNA sequences (B) Plant reproduction (C) Natural disasters (D) Gamma radiation (E) biological diversity (F) DNA sequences staying the same (G) the environment (H) that material's properties

Ex Output:
A

Ex Input:
Fact1: if fossils of an animal or plant are found in a place then that animal or plant used to live in that place, Fact2: Fossils are the remains of prehistoric life., Question: What found in a place shows that animal or plant used to live in that place? (A) remains (B) Echinoids (C) dirt (D) Earthworms (E) unique (F) an image (G) rocks (H) water

Ex Output:
A

Ex Input:
Fact1: erosion causes a river to become deeper and wider, Fact2: Canyon formed as a consequence of river erosion., Question: What are formed by erosion? (A) mountains (B) hills (C) canyons (D) Sediment (E) loose soil (F) rocks (G) soils (H) streams

Ex Output:
C