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: 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: mechanical weathering is when rocks are broken down by mechanical means, Fact2: Water is a mechanical weathering force., Question: What  weathers rocks? (A) soil (B) streams (C) a delta (D) calcite (E) erosion (F) water (G) grass (H) the sun
[EX A]: F

[EX Q]: Fact1: a valley is formed by a river flowing, Fact2: Fast flowing rivers tend to pick up more pebbles, sand and other materials that cause erosion., Question: How does water cause a valley to form? (A) Physical weathering (B) By the process of erosion (C) By falling from clouds (D) It used to be covered by water (E) fissures of hot, acidic water (F) Heavy snow accumulation (G) By forming puddles (H) Water expanding
[EX A]:
B