I want to know the answer to the following question:
London's Tate Britain and Tate Modern galleries were formerly one entity known as what?
All the background I'm provided with is that "The Tate Gallery, as it was formerly known, also became a major centre for modern art; in 2000 this collection moved to Tate Modern, a new gallery housed in the former Bankside Power Station.". Is that enough to answer the question?
Answer: yes