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: 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: friction causes an object to lose energy, Fact2: Objects An object can be one of several things., Question: What does friction cause things to lose? (A) heat (B) moisture (C) toughness (D) Energy. (E) traits (F) light (G) energy (H) cartilage
[EX A]: G

[EX Q]: Fact1: Cells vary in size as well as shape, but all cells are very small., Fact2: All cells are microscopic in size., Question: What varies in shape but are all microscopic? (A) alveoli (B) small (C) ovaries (D) cells (E) bushes (F) ferns (G) fossils (H) fungi
[EX A]:
D