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: Mollusks reproduce sexually., Fact2: Mollusks are the dominant invertebrate., Question: what reproduces sexually? (A) A compound that donates proton (B) spread flower seeds (C) They have webbed feet (D) Plant reproduction (E) By wind and rain (F) passenger pigeons (G) the dominant invertebrate (H) Something found in San Francisco
[EX A]: G

[EX Q]: Fact1: the Earth being tilted on its rotating axis causes seasons, Fact2: Spring, summer, autumn, and winter are the seasons of the year., Question: What causes spring, summer, autumn, and winter? (A) meteor showers (B) heat production (C) the sun's energy (D) Generating heat (E) Earth tilted on rotating axis (F) Something with a head, thorax, and abdomen (G) Earth vibrating (H) lunar cycle
[EX A]: E

[EX Q]: Fact1: a balance is used for measuring mass of an object, Fact2: Mass Amount of matter an object contains., Question: What can be used to measure the amount of matter an object contains? (A) Joules (B) density (C) Protractor (D) Thermometer (E) energy (F) Balance (G) Accelerometer (H) microscope
[EX A]:
F