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").

[Q]: Fact1: extreme heat and pressure change rock into metamorphic rock, Fact2: Marble is a form of metamorphic rock., Question: What is formed from extreme heat and pressure? (A) glass (B) marble (C) crust (D) soils (E) coal (F) sugar (G) calcite (H) arteries
[A]: B


[Q]: Fact1: staying warm has a positive impact on an animal 's survival, Fact2: Furry animals grow thicker coats to keep warm in the winter., Question: Furry animals grow thicker coats which has what impact on their survival? (A) heat (B) positive (C) negative (D) energy (E) ironic (F) Energy. (G) decreased (H) adding heat
[A]: B


[Q]: Fact1: Viruses are so small that they can be seen only with an electron microscope., Fact2: Once the camera is tuned with the microscope, the focusing depends on the microscope lens., Question: Viruses are so small that they can be seen by what? (A) focusing a lens (B) A computer (C) looking close (D) rays or beams (E) sunlight (F) bending light rays (G) seeing smaller (H) tuning eyes
[A]:
A