user: Question: What is the type shown from 1991 BC?
Columns: ['Type', 'Name', 'Title', 'Royal house', 'From']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Sovereign', 'Mentuhotep II', 'Pharaoh', 'Eleventh dynasty', '2010 BC']
SQL:

assistant: SELECT "Type" FROM "Table" WHERE "From" = '1991 BC';