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

Input: Consider Input: Lizards keep their eggs in rotting trees.

Output: What do Lizards keep their eggs in?


Input: Consider Input: People describes things with their appearance.

Output: What do people describe things with?


Input: Consider Input: Muscles in the upper arm lengthen a person's elbow.


Output: What lengthen a person's elbow?