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: Adult worms go through a major transformation to develop reproductive organs., Fact2: An enlarged cummerbund-like band near the worm's head holds the reproductive organs., Question: What grows a cumberbund-like band around itself in adulthood? (A) legumes (B) Bats (C) mammals (D) bamboo (E) swea (F) worms (G) fungi (H) bushes
[EX A]: F

[EX Q]: Fact1: Chromosomes are coiled structures made of DNA and proteins., Fact2: DNA is deoxyribonucleic acid., Question: chromosomes are coiled structures made of proteins and what? (A) solid, liquid, gas (B) density (C) Something that causes allergies (D) deoxyribonucleic acid (E) It helps them survive (F) inheritance (G) blood cells (H) allow growth
[EX A]: D

[EX Q]: Fact1: most canyons are formed by flowing rivers through erosion over long periods of time, Fact2: Rivers and glaciers are made of water., Question: Flowing water forms most canyons through erosion over what? (A) movement of tectonic plates (B) dry streambeds (C) long periods of time (D) Physical weathering (E) Time and energy (F) short periods of time (G) massive damage (H) calving glaciers
[EX A]:
C