The phrase "a controversial question" is correct and usable in written English.
You can use it to refer to a question that is likely to be seen as debatable, or to which people have different opinions. For example: "The question of whether to raise taxes in order to improve public services is a controversial question that has been debated for many years."
"They told me it was a controversial question".
Whether automatic syntactic analysis and fully automatic high-quality machine translation are even feasible in principle remains a controversial question.
A richly detailed account of a controversial question by a British historian and biographer.The Sugar Barons: Family, Corruption, Empire, and War in the West Indies.
Obesity and excess weight do shorten lives, according to a major review across five continents which sought to find a definitive answer to a controversial question.
A national test publisher has defended a controversial question involving a talking pineapple on one of its reading tests for New York State, saying it was confident that its tests were "valid and reliable".
To what extent the structure of a particular language is determined by or determines the form and content of the culture with which it is associated remains a controversial question.
Although the role of oxidative stress in pathology remains an open controversial question, a clear iron dysregulation (mainly illustrated by mitochondrial iron accumulation) is observed in FRDA (Lamarche et al., 1993; Michael et al., 2006; Koeppen et al., 2007).
"It is a very controversial question," said Abraham Barrero Ortega, a professor of constitutional law at the University of Seville.
It's a surprisingly controversial question, given the number of seniors taking statins.
A most controversial question is related to the time delay between FD and cloud structure modification.
Some military observers are posing a different controversial question: Why do so many unmanned drones end up in pieces on the ground?
