Given a statement, generate a question such that the answer is contained in that statement.

Ex Input:
Fly larvae enter the host through epithelial tissue

Ex Output:
What enters the host through epithelial tissue?


Ex Input:
nonvascular plants are autotrophs in aquatic ecosystems

Ex Output:
What are autotrophs in aquatic ecosystems?


Ex Input:
a sifter is used for some instructions

Ex Output:

What is used for instructions?