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

Q: bones heal without surgery

A: What do bones heal without?
****
Q: Most species go through stages of ingesting nutrients and growth after hatching

A: What stages do most species go through after hatching?
****
Q: metal, stainless steel and plastic are used to support towers.

A:
What type of steel is used to support towers?
****