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

[EX Q]: The main advantage of urea is its very low toxicity.
[EX A]: The main advantage of urea is its very low what?

[EX Q]: Ionic compounds contain cations and anions rather than discrete neutral molecules.
[EX A]: Ionic compounds contain cations and anions rather than what?

[EX Q]: Children most likely inherit shape of earlobes from their parents.
[EX A]:
Which trait do children most likely inherit from their parents?