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: Skin color is another polygenic trait., Fact2: Tourette syndrome a polygenic disorder ., Question: what is tourette syndrome? (A) malaria (B) cancer (C) trait (D) fever (E) cell (F) antigen (G) virus (H) Type O

Ex Output:
C

Ex Input:
Fact1: Carbon may be stored in sedimentary rock for millions of years., Fact2: Limestone is a type of sedimentary rock., Question: What element can be stored in limestone for millions of years? (A) oxygen (B) Energy (C) matter (D) carbon (E) sodium (F) helium (G) rock salt (H) heat

Ex Output:
D

Ex Input:
Fact1: Wetlands are extremely important biomes., Fact2: Marshes and swamps are wetlands., Question: What are extremely important biomes? (A) important habitats (B) urban city (C) remains of prehistoric life (D) zoos (E) water conservation (F) Most plants (G) manmade aqueducts (H) marshes and swamps

Ex Output:
H