What is the White House?

The White House serves as the official residence and workplace of the President of the United States. It is a symbol of the presidency and is located at 1600 Pennsylvania Avenue NW in Washington, D.C. As the primary residence for the sitting president, it not only provides living quarters but also houses various official offices for the president and their staff. This makes it a crucial site for the administration of the U.S. government and a central venue for diplomatic events and ceremonies.

The other options, while related to important functions of government, refer to different institutions. The Senate's building is a specific place for legislative activities, Congress Hall pertains to the wider legislative body, and the Supreme Court building is dedicated to the judicial branch. Each of these serves distinct purposes within the framework of the U.S. government, but they do not hold the same significance as the White House in relation to the presidency.