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

Example Input: Line graphs are especially useful for showing changes over time.
Example Output: Line graphs are especially useful for showing changes over what?

Example Input: Mucous does the esophagus produce for lubrication.
Example Output: What does the esophagus produce for lubrication?

Example Input: Exposure to chemical or biological agents can cause an acquired immunodeficiency later in life.
Example Output:
What can exposure to chemical or biological agents cause later in life?