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: 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: cold fronts cause thunderstorms as they pass by, Fact2: Thunderstorms create havoc., Question: What do cold fronts cause? (A) death (B) complex (C) wind (D) streams (E) deadly (F) disease (G) havoc (H) mildew
[A]: G


[Q]: Fact1: Mammals conserve body heat with their hair or fur., Fact2: Bats Bats are mammals with wings., Question: What conserves body heat with their fur? (A) hawks (B) shrews (C) flying fish (D) pigs (E) humans (F) dogs (G) crocodiles (H) bats
[A]:
H