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: chemical weathering causes iron in rock to oxidize, Fact2: Oxides Oxides Oxides are elements combined with oxygen., Question: Chemical weathering causes iron in rock to combine with what? (A) uranium (B) oxygen (C) cartilage (D) nothing (E) an object (F) vacuum (G) energy (H) heat

Ex Output:
B


Ex Input:
Fact1: Behaviors that improve fitness increase through natural selection., Fact2: Fitness traits relate to an animal s ability to survive and reproduce., Question: behaviors increase through what that improve traits of animal's ability to survive (A) competition (B) hunting (C) biological diversity (D) the environment (E) eating (F) produce offspring (G) natural selection (H) grooming

Ex Output:
G


Ex Input:
Fact1: Earthworm burrows help aerate soil, which is also good for plants., Fact2: Aeration quickly changes the chemistry of the soil., Question: What do earthworms do to soil? (A) Destroy soil (B) Damages them (C) Exfoliation (D) Converting waste. (E) competing for resources (F) Compact soil (G) Make soil denser (H) Change the chemistry

Ex Output:

H