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").

[Q]: Fact1: if a thermal conductor is exposed to a source of heat then that conductor may become hot, Fact2: Copper is a great thermal conductor., Question: What becomes hot when exposed to a source of heat? (A) rubber (B) wool (C) an object (D) copper (E) paper (F) sugar (G) the skin (H) our star
[A]: D


[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
[A]: A


[Q]: Fact1: Sponges have specialized cells called collar cells., Fact2: Special cells called collar cells pick up the planktonic food and start the digestive process., Question: What does a sponge's specialized cell do when it picks up planktonic food? (A) Starts to digest (B) transportation (C) capture prey (D) Reproduces (E) a producer (F) saves lives (G) Dies (H) occurs over a wide range
[A]:
A