Possible to have hierarchical question category listing?


Is it possible to have the dropdown of question categories in a hierarchical format, with the category parent also present and sub-categories listed below?
For example:
– Dentists
– Doctors
– Chiropractors
and then, each parent category following that also with sub-categories to choose from? Perhaps even with the parent category as a dummy category there just for formatting purposes so that categories of categories are easily identifiable?

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