user: Question: what is the type of lithium when rubidium is NaBr (1.9)?
Columns: ['Lithium', 'Sodium', 'Potassium', 'Rubidium', 'Caesium']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Lithium', 'Sodium', 'Potassium', 'Rubidium', 'Caesium']
SQL:

assistant: SELECT "Lithium" FROM "Table" WHERE "Rubidium" = 'NaBr (1.9)';