title: National debt of the United States
context: As of December 31, 2018, debt held by the public was $16.1 trillion and intragovernmental holdings were $5.87 trillion, for a total or "National Debt" of $21.97 trillion.[5]  Debt held by the public was approximately 76.4% of GDP in Q3 2018[6].  In 2017, the US debt-to-GDP ratio was ranked 43rd highest out of 207 countries.[7] The Congressional Budget Office forecast in April 2018 that the ratio will rise to nearly 100% by 2028, perhaps higher if current policies are extended beyond their scheduled expiration date.[8]
question: What is the U.S. National Debt?
answers: $21.97 trillion