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: Cells are the basic units of the structure and function of living things., Fact2: Tigers are the largest of the living cats., Question: Cells are the basic units of the structure and function of what? (A) water (B) mammals (C) ice (D) tigers (E) animals (F) humans (G) plants (H) the Sun
[EX A]: D

[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: if a living thing becomes too cold then that living thing will die, Fact2: Biology is the science of living things., Question: Something studied by which scientists will die if it gets too cold? (A) Physicists (B) Meteorologists (C) Frogs (D) fossil fuels (E) Chemists (F) Biologists (G) satellites (H) trout
[EX A]:
F