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

Example Input: Carbon 14 isotope of carbon is typically used to date ancient items.
Example Output: What isotope of carbon is typically used to date ancient items?

Example Input: A wall of rocks or concrete a called a groin.
Example Output: What is a wall of rocks or concrete called?

Example Input: Bases are the ionic compounds that produce negative hydroxide ions when dissolved in water.
Example Output:
What are the ionic compounds that produce negative hydroxide ions when dissolved in water?