The word "question" is correct and usable in written English. You can use it to ask a rhetorical question or to make a direct inquiry. For example, "What is the question that nobody can answer?".
[He was answering a question, says one of the questioners].
Got a question?
The question is why.
That's a hard question.
"I don't know the answer to that question.
It is time to settle this European question in British politics".
I don't think I'm qualified to answer a question like that.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK