instruction:
Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.
question:
Fact: Plants exhibit phototropism, or growing toward the sun or artificial light. 
Question: What is called when plants grow toward the sun or an artificial light?
answer:
phototropism.


question:
Fact: Bacteria can cause food to spoil. 
Question: What causes food to spoil?
answer:
Bacteria.


question:
Fact: plucking a string transmits to the saddle. 
Question: what transmits to the saddle?
answer:

string.