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").
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Question: 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

Answer: A

Question: Fact1: Bone provides protection for soft tissues and internal organs., Fact2: Bone matrix consists of collagen and minerals., Question: What provides protection for soft tissues and internal organs? (A) Blankets (B) barnacles (C) Epidermis (D) mammals (E) Collegen (F) Animal fur (G) a cuticle (H) fur and fat

Answer: E

Question: Fact1: a cavern is formed by carbonic acid in groundwater seeping through rock and dissolving limestone, Fact2: Underground caves and caverns pose an exciting adventure to many., Question: What can be formed by carbonic acid in groundwater seeping through rock and dissolving limestone? (A) water (B) swamp vegetation (C) Calcium carbonate (D) sunlight (E) contamination (F) loose soil (G) underground caves (H) arsenic

Answer:
G