user: Question: Which Baltimore group is of the Retroviridae family?
Columns: ['Family', 'Baltimore group', 'envelopment', 'Virion shape', 'Replication site']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Adenoviridae', 'Group I', 'non-enveloped', 'icosahedral', 'nucleus']
SQL:

assistant: SELECT "Baltimore group" FROM "Table" WHERE "Family" = 'Retroviridae';