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: Plants are the major producers in terrestrial biomes., Fact2: Grasses are very distinctive plants., Question: What is a producer in terrestrial biomes? (A) food (B) Oak (C) mammals (D) flowers (E) earth (F) grass (G) Trees (H) mushrooms

Ex Output:
F

Ex Input:
Fact1: Organisms cluster around hydrothermal vents in the ocean floor., Fact2: To survive, some organisms living near hydrothermal vents have formed close associations., Question: How is survival ensured around hydrothermal vents? (A) heat produced (B) Eating a lot (C) Reproducing quickly (D) biological diversity (E) vegetation (F) Being in a cluster (G) Staying far apart (H) hydrate their cells

Ex Output:
F

Ex Input:
Fact1: chemical weathering causes iron in rock to oxidize, Fact2: Iron oxides are produced that are red, orange, or brown in color., Question: What does chemical weather cause iron to do? (A) Change to rainbow colors (B) flow of electrons (C) contamination (D) Stay the same (E) It gets heated up (F) Plant growth is reduced (G) Change gender (H) Change color to brown

Ex Output:
H