user: Question: Which Ch of Senators has a Lema/SUBLema of Lema?
Columns: ['LEMA/SUBLEMA', 'Candidates', 'Votes', 'Ch. of Senators', 'Ch. of Deputies']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['National Party', 'Total', 765990.0, '12', '39']
SQL:

assistant: SELECT "Ch. of Senators" FROM "Table" WHERE "LEMA/SUBLEMA" = 'Lema';