input with options: Q: In the humoral response, what protein substances help neutralize or eliminate toxins and pathogens in the blood and lymph? A:
OPTIONS:
- platelets
- membranes
- parasites
- antibodies
output: antibodies

input with options: Q: What heisenberg principle imposes ultimate limits on what is knowable in science? A:
OPTIONS:
- impossibility principle
- vacuum principle
- certainty principle
- uncertainty principle
output: uncertainty principle

input with options: Q: Ice floats because it is less what than liquid water? A:
OPTIONS:
- heavy
- gaseous
- warm
- dense
output: dense

input with options: Q: All matter in the universe is composed of one or more unique pure substances called what? A:
OPTIONS:
- atoms
- molecules
- compounds
- elements
output:
elements