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: transportation technology is used for moving people, Fact2: Model rocketry is an exciting way to study transportation technology., Question: Model rocketry can be used to study how people are what? (A) able to read (B) warm (C) dead (D) living (E) moved (F) born (G) humans (H) moved by emotion
[EX A]: E

[EX Q]: Fact1: Ancestors of hagfish are thought to have been the earliest vertebrates., Fact2: Property of ancestors and forefathers can only be legally inherited by sons., Question: Forefathers of what kind of fish are thought to be the earliest vertebrates? (A) hagfish (B) Pelycosaur (C) fish (D) angiosperm (E) adult (F) Therapsids (G) marine (H) aquatic
[EX A]: A

[EX Q]: Fact1: planting trees has a positive impact on an ecosystem, Fact2: An ecosystem includes the organisms and their habitat., Question: Doing what has a positive impact on organisms and their habitat? (A) hydrate their cells (B) exercise (C) By coral exoskeletons (D) planting trees (E) trimming trees (F) planting grass (G) buying flowers (H) support
[EX A]:
D