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").

Example 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
Example Output: F

Example Input: Fact1: Playing is one way mammals and other animals learn how to behave., Fact2: Opossums are a type of mammal called marsupials., Question: what plays to learn how to behave? (A) opossums (B) humans (C) people (D) fish (E) exercise (F) ants (G) h2o (H) catabolism
Example Output: A

Example Input: Fact1: Most invertebrates have a nervous system., Fact2: Jellyfish and insects are invertebrates., Question: What has a nervous system? (A) fur seals (B) Jellyfish (C) Rocks (D) chickens (E) animals (F) Air (G) h2o (H) elephants
Example Output:
B