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: insulated material can be used for keeping warm, Fact2: An insulated cup with a cover is great for keeping beverages warm., Question: How do you keep a cup hot? (A) less water (B) electricity (C) heat energy (D) adding heat (E) energy usage (F) insulation (G) squeeze (H) energy
[EX A]: F

[EX Q]: Fact1: melting is when solids are heated above their melting point, Fact2: Ice cubes melt in liquid water., Question: What, when heated, turns into liquid water? (A) gasoline (B) oil (C) a solute (D) fire (E) ice cubes (F) a prism (G) mussels (H) Energy.
[EX A]: E

[EX Q]: Fact1: microbial fuel cells convert chemical energy into electrical energy, Fact2: Electricity is a kinetic energy., Question: Microbial fuel cells convert chemical energy into  (A) kinetic energy (B) Deoxyribonucleicacid (C) rays or beams (D) harmful substances (E) vehicles (F) sunlight (G) deoxyribonucleic acid (H) Greenhouse gases
[EX A]:
A