You are presented with the quiz "What is ethanol produced from?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "ethanol is produced by alcoholic fermentation of the glucose in corn or other plants" and "glucose, a type of sugar, is the body's fuel". So, what's the best answer to the question?

OPTIONS:
- coal
- sugar
- SO2
- animal fat
- paper
- salts
- Trees
- Oak

Answer: sugar

You are presented with the quiz "What has a backbone?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "vertebrates are animals that have a backbone" and "human beings are vertebrates". So, what's the best answer to the question?

OPTIONS:
- Humans
- sharks
- Jellyfish
- Snails
- ferns
- Hornets
- people
- insects

Answer: Humans

You are presented with the quiz "Light enters the eye through an opening that is what to light and accommodation?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "light enters the eye through an opening called the pupil" and "pupils are reactive to light and accommodation". So, what's the best answer to the question?

OPTIONS:
- reactive
- destroyed
- inactive
- an object
- It expands
- kinetic
- warm
- inorganic

Answer: reactive

You are presented with the quiz "Heavy metals are _." But you don't know the answer, so you turn to your teacher to ask for hints. He says that "antigens are molecules that the immune system recognizes as foreign to the body" and "heavy metals are, in general, foreign to the body". So, what's the best answer to the question?

OPTIONS:
- emissions
- dangerous
- bent
- homogenous
- antigens
- vehicles
- fossil fuels
- heat energy

Answer:
antigens