What is largest room in the executive residence?

As an AI language model, I don't have access to current information; however, the largest room in the Executive Residence, also known as the White House, is the East Room. It measures approximately 40 feet by 82 feet and has a ceiling height of 22 feet. The room is used for various ceremonial and official events, including receptions, press conferences, and formal dinners. The room features historic furnishings, such as chandeliers, mirrors, and fireplaces, and also has a grand piano, which is often used for musical performances. The East Room has witnessed many historic moments throughout its history, including presidential inaugurations, state funerals, and diplomatic ceremonies.