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: Cells are organized into tissues, and tissues form organs., Fact2: Major organs, including the kidneys and liver, begin to grow., Question: what forms the liver? (A) bile (B) alcohol (C) stones (D) animals (E) ovaries (F) cells (G) meat (H) humans

Ex Output:
F

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: an animal requires energy to move, Fact2: When an animal moves, it burns energy., Question: What allows for movement in animals? (A) the digestive system (B) an external framework (C) energizing crystals (D) Veins and arteries. (E) spinning wheels (F) burning energy (G) arteries (H) changing tires

Ex Output:
F