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 light bulb is used for seeing in the dark, Fact2: Light is emitted by a light bulb., Question: What is required for seeing? (A) dark (B) sun (C) light (D) wind (E) retina (F) eyes (G) photons (H) copper
[EX A]: C

[EX Q]: Fact1: Evaporation of sweat uses energy, and the energy comes from body heat., Fact2: When sweat is evaporated into the air, it provides additional cooling., Question: Energy that comes from body heat can help with  (A) recovery (B) commuting (C) movement (D) cooling (E) strength (F) stay warm (G) health (H) motion
[EX A]: D

[EX Q]: Fact1: weathering means breaking down rocks from larger whole into smaller pieces by weather, Fact2: Climates with freeze and thaw promote mechanical weathering., Question: What can can break down rocks from larger wholes into smaller pieces? (A) Earthworms (B) sea urchins (C) Freezing and thawing (D) Calcium carbonate (E) Compaction (F) mechanical (G) Sedimentation (H) Cementation
[EX A]:
C