Turn the given fact into a question by a simple rearrangement of words. This typically involves replacing some part of the given fact with a WH word. For example, replacing the subject of the provided fact with the word "what" can form a valid question. Don't be creative! You just need to rearrange the words to turn the fact into a question - easy! Don't just randomly remove a word from the given fact to form a question. Remember that your question must evaluate scientific understanding. Pick a word or a phrase in the given fact to be the correct answer, then make the rest of the question. You can also form a question without any WH words. For example, "A radio converts electricity into?"

Input: Consider Input: Fact: a bulb requires electrical energy to produce rays.

Output: A bulb uses electrical energy to produce:?


Input: Consider Input: Fact: Malpighian tubules are organs of excretion.

Output: What are organs of excretion?


Input: Consider Input: Fact: When a parasite produces memory cells, active immunity results.


Output: What creates active immunity from a parasite?