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: insulated material can be used for keeping warm, Fact2: An insulated cup with a cover is great for keeping beverages warm., Question: How do you keep a cup hot? (A) less water (B) electricity (C) heat energy (D) adding heat (E) energy usage (F) insulation (G) squeeze (H) energy
[A]: F


[Q]: Fact1: pesticides can cause pollution, Fact2: Pollution can also hurt animal and plant populations., Question: What can hurt plant populations? (A) mines (B) fossil fuels (C) Soil (D) contamination (E) bacteria (F) Water (G) Nutrients (H) Pesticides
[A]:
H