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: Evolution is a change in the characteristics of living things over time., Fact2: Trees are the largest of living things., Question: Evolution changes the characteristics of what over time? (A) the Moon (B) Man (C) life (D) trees (E) rocks (F) the Sun (G) humans (H) plants
[EX A]: D

[EX Q]: Fact1: Cells are the basic units of the structure and function of living things., Fact2: All cells use glucose for energy., Question: What do all living things use for energy? (A) fish (B) kids (C) energy (D) glucose (E) The Sun (F) procreation (G) sunlight (H) food
[EX A]: D

[EX Q]: Fact1: phase changes do not change mass, Fact2: Melting is a phase change., Question: What does not change during melting? (A) Solid (B) Density (C) energy (D) vapors (E) O3 (F) fats (G) Mass (H) Sublimation
[EX A]:
G