user: Question: Which class has a Year of 1968?
Columns: ['Year', 'Team', 'Co-Drivers', 'Class', 'Pos.', 'Class Pos.']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1966.0, 'Matra Sports', 'Jean-Pierre Jaussaud', 'P 2.0', 'DNF', 'DNF']
SQL:

assistant: SELECT "Class" FROM "Table" WHERE "Year" = 1968.0;