user: Question: how many categories fall under the category of Britons?
Columns: ['Institution', 'Location', 'Nickname', 'Founded', 'Type', 'Enrollment', 'Joined']
Types: ['text', 'text', 'text', 'real', 'text', 'real', 'text']
Sample row: ['Adrian College', 'Adrian, Michigan', 'Bulldogs', 1859.0, 'Private/Methodist', 1040.0, '1908 2']
SQL:

assistant: SELECT COUNT("Type") FROM "Table" WHERE "Nickname" = 'Britons';