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: a mutation in the sex cells of a parent can cause a new trait to appear in the parent 's offspring, Fact2: Animals that reproduce sexually produce sex cells, or gametes., Question: a mutation in the _ of a parent can cause a new trait to appear in the parent 's offspring (A) eggs (B) courtship (C) mitochondria (D) alleles (E) pollen (F) gametes (G) ATP (H) hormones
[EX A]: F

[EX Q]: Fact1: Carbon may be stored in sedimentary rock for millions of years., Fact2: Limestone is a type of sedimentary rock., Question: What element can be stored in limestone for millions of years? (A) oxygen (B) Energy (C) matter (D) carbon (E) sodium (F) helium (G) rock salt (H) heat
[EX A]: D

[EX Q]: Fact1: Most carcinogens cause cancer by producing mutations in DNA., Fact2: DNA DNA is deoxyribonucleic acid., Question: what do carcinogens cause mutations in? (A) that material's properties (B) sub-units of species (C) Microscopic organisms (D) deoxyribonucleic acid (E) a lot of human deaths (F) the body's largest organ (G) harmful substances (H) female sex cells
[EX A]:
D