I want to know the answer to the following question:
The Princess Theatre, Regent Theatre, and Forum Theatre are members of which of Melbourne's theater districts?
All the background I'm provided with is that "The city's East End Theatre District includes theatres that similarly date from 1850s to the 1920s, including the Princess Theatre, Regent Theatre, Her Majesty's Theatre, Forum Theatre, Comedy Theatre, and the Athenaeum Theatre.". Is that enough to answer the question?