The phrase "controversial question" is correct and can be used in written English.
For example, "What is the controversial question at the heart of the argument?".
One is the controversial question of identity.
These were left unchanged because of the controversial question involved.
A most controversial question is related to the time delay between FD and cloud structure modification.
"They told me it was a controversial question".
But Prewitt's biggest concern is the addition of a controversial question.
Two Stanford scholars debate a controversial question: Why are nutrition studies so often unreliable?
Distinguishing between good teachers and bad ones, however, is reform's most controversial question.
It's a surprisingly controversial question, given the number of seniors taking statins.
Her response to virtually any controversial question is that the matter needs to be studied.
But all aimed to settle the controversial question of human expansion from Africa.
