Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| School | Mascot | Location | Size | IHSAA Class | County |
| --- | --- | --- | --- | --- | --- |
| Forest Park | Rangers | Ferdinand | 444.0 | AA | 19 Dubois |
| Gibson Southern | Titans | Fort Branch | 710.0 | AAA | 26 Gibson |
| Heritage Hills | Patriots | Lincoln City | 674.0 | AAA | 74 Spencer |
| North Posey | Vikings | Poseyville | 496.0 | AA | 65 Posey |
| Pike Central | Chargers | Petersburg | 599.0 | AAA | 63 Pike |
| Southridge | Raiders | Huntingburg | 528.0 | AA | 19 Dubois |
| South Spencer | Rebels | Rockport | 498.0 | AA | 74 Spencer |
| Tecumseh | Braves | Lynnville | 261.0 | A | 87 Warrick |
| Tell City | Marksmen | Tell City | 462.0 | AA | 62 Perry |
Question:
What is the county with an AA IHSAA class in ferdinand?
Answer:
19 Dubois