user: Question: Who was the manufacturer for Matt Kenseth on March 7?
Columns: ['Year', 'Date', 'Driver', 'Team', 'Manufacturer', 'Laps', 'Miles (km)', 'Race Time', 'Average Speed (mph)', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1998', 'March 1', 'Mark Martin', 'Roush Racing', 'Ford', '267', '400.5 (644.542)', '2:43:58', '146.554', 'Report']
SQL:

assistant: SELECT "Manufacturer" FROM "Table" WHERE "Driver" = 'Matt Kenseth' AND "Date" = 'March 7';