input with options: Q: Resonance has been used in what kind of human-made recreational objects since prehistoric times? A:
OPTIONS:
- toys
- paintbrushes
- arrows
- musical instruments
output: musical instruments

input with options: Q: Which theory explains how populations of organisms can change over time? A:
OPTIONS:
- free by natural selection
- changes by natural selection
- intelligent selection
- evolution by natural selection
output: evolution by natural selection

input with options: Q: Which area of the human heart pumps the blood to the right ventricle? A:
OPTIONS:
- left atrium
- true atrium
- left ventricle
- right atrium
output: right atrium

input with options: Q: Gibbs free energy values can be used to determine what? A:
OPTIONS:
- equilibrium differentials
- prime constants
- equal lines
- equilibrium constants
output:
equilibrium constants