Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Example Input: Cancer occurs most often in adults over fifty age.
Example Output: Cancer occurs most often in adults over what age?

Example Input: A covalent network solid is a compound in which all of the atoms are connected to one another by covalent bonds.
Example Output: What is a compound in which all of the atoms are connected to one another by covalent bonds?

Example Input: Reflex behaviors are the only innate behaviors in humans.
Example Output:
What are the only innate behaviors in humans?