The phrase "a central question is" is correct and usable in written English.
It can be used when introducing a key issue or topic that is important to the discussion or analysis at hand.
Example: "In the context of climate change, a central question is how we can effectively reduce carbon emissions while maintaining economic growth."
Alternatives: "a key issue is" or "a fundamental question is".
A central question is whether the accusations will fit the court's mandate.
FOR many voters this year, a central question is how to maintain what they consider as America's greatness, its exceptionalism.
A central question is how close Mr. Ivanishvili will bring Georgia to Russia, the country where he earned his billions.
But a central question is how much land he is willing to part with, and how soon.
A central question is whether Syria has given complete details of its program and an arsenal estimated to include 1,000 tons of chemicals and nerve agents.
But a central question is whether the deaths are symptoms of something more ominous: the collapse of the natural balance that sustains the 156-mile estuary's northern reaches.
If the accounts of Iraqi gunfire from the tower are accurate, a central question is when the Iraqis in the tower began to shoot.
Inevitably, a central question is how certain one can be of the authenticity of the documents, which were provided as computer printouts.
As NATO presidents and prime ministers prepare to meet next month in Chicago, a central question is how large an Afghan security force the international alliance will agree to continue financing.
A central question is whether the crew or managers on the Horizon were in too much of a hurry to wrap up the work and move to the next job.
As the current confrontation continues, a central question is whether the military will stage another coup with a claim that it is restoring order, despite a promise by the army chief, Gen. Anupong Paochinda, that this would not happen.
