user: Question: What's the Period with # found of 5?
Columns: ['Location', 'Culture', '# found', 'Ball diameter', 'Period']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['El Manati', 'Olmec', '5', '10–14cm', '1600–1700 BCE']
SQL:

assistant: SELECT "Period" FROM "Table" WHERE "# found" = '5';