Task: Question Generation
Input (English): The largest theatre in the city is the 2,300 capacity Mayflower Theatre (formerly known as the Gaumont), which, as the largest theatre in Southern England outside London, has hosted West End shows such as Les Misérables, The Rocky Horror Show and Chitty Chitty Bang Bang, as well as regular visits from Welsh National Opera and English National Ballet. There is also the Nuffield Theatre based at the University of Southampton's Highfield campus, which is the city's primary producing theatre. It was awarded The Stage Award for Best Regional Theatre in 2015. It also hosts touring companies and local performing societies (such as Southampton Operatic Society, the Maskers and the University Players).
Output (English): Which Southampton theatre won The Stage Award for Best Regional Theatre for 2015?