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: pathogens can cause disease, Fact2: Fungi are significant pathogens., Question: What can fungi do? (A) protect them (B) survive (C) Spread disease (D) migrate (E) hydrate their cells (F) decrease stamina (G) reproduce (H) aerobic capacity
[EX A]: C

[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: Birds are endothermic tetrapod vertebrates., Fact2: Animals with backbones are called vertebrates., Question: which of the following are endothermic tetrapod animals with backbones? (A) a fish (B) alpacas (C) birds (D) toads (E) animals (F) sharks (G) long (H) bats
[EX A]:
C