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: Precipitation increases moisture., Fact2: Rain is liquid precipitation., Question: what increases moisture? (A) density (B) the sun (C) wind (D) rain (E) Honey (F) 17 (G) droughts (H) Type O
[EX A]: D

[EX Q]: Fact1: mechanical weathering is when rocks are broken down by mechanical means, Fact2: Pysical weathering is the mechanical breakdown of rocks., Question: What is when rocks are broken down? (A) roof weathering (B) Plant growth is reduced (C) brick weathering (D) Physical weathering (E) remains of prehistoric life (F) at or near the margins (G) home weathering (H) major threat to health
[EX A]: D

[EX Q]: Fact1: knowledge of the stars can be used to navigate, Fact2: Explorers have used the North Star for navigational purposes for centuries., Question: What have explorers traditionally used to orient themselves? (A) clocks (B) sponges (C) hairs (D) waves (E) vehicle (F) osculum (G) harpoons (H) stars
[EX A]:
H