Task: Question Answering
Input (English): passage: The Burj Khalifa (Arabic: برج خليفة‎, Arabic for ``Khalifa Tower''; pronounced English: /ˈbɜːrdʒ kəˈliːfə/), known as the Burj Dubai prior to its inauguration in 2010, is a skyscraper in Dubai, United Arab Emirates. With a total height of 829.8 m (2,722 ft) and a roof height (excluding antenna) of 828 m (2,717 ft), the Burj Khalifa has been the tallest structure and building in the world since its topping out in late 2008.
 question: the burj khalifa in dubai is the world tallest building?
Output (English): Yes