I want to know the answer to the following question:
Which symphony of Anton Bruckner's does the Wagner tuba have a prominent role in?
All the background I'm provided with is that "Unless these instruments are played by members doubling on another instrument (for example, a trombone player changing to euphonium for a certain passage), orchestras will use freelance musicians to augment their regular rosters.". Is that enough to answer the question?
Answer: no