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 Q]: 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 A]: F

[EX Q]: Fact1: Plants live just about everywhere on Earth., Fact2: Epiphytes are plants that live on other plants., Question: Where do epiphytes live? (A) swamp vegetation (B) mountains (C) vegetation (D) the environment (E) peachleaf willow (F) ice (G) rocks (H) everywhere on earth
[EX A]: H

[EX Q]: Fact1: Amphibians have a relatively complex circulatory system with a three-chambered heart., Fact2: All frogs are amphibians., Question: what have a relatively complex circulatory system with three-chambered heart? (A) sharks (B) humans (C) bacteria (D) Birds (E) blood (F) frogs (G) salmon (H) pacemaker
[EX A]:
F