user: Question: What is Party, when District is less than 10, when Took Office is less than 1991, and when Home Town is Mount Pleasant?
Columns: ['Senator', 'Party', 'District', 'Home Town', 'Took Office']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Bill Ratliff', 'Republican', 1.0, 'Mount Pleasant', 1989.0]
SQL:

assistant: SELECT "Party" FROM "Table" WHERE "District" < 10.0 AND "Took Office" < 1991.0 AND "Home Town" = 'Mount Pleasant';