premise: Clay County is a county located in the U.S. state of Tennessee. As of the 2010 census, the population was 7,861. Its county seat and only incorporated city is Celina. Clay County is named in honor of American statesman Henry Clay, member of the United States Senate from Kentucky and United States Secretary of State in the 19th century. Its current mayor is Dale Reagan.
hypothesis: The city of Celina has a population of 861.
reason: The statement never mentioned the population of Celina itself. The machine was fooled because it confused the 861 number with the 7,861 population of Clay county.