user: ### NOW ANSWER:
Question: what year did North Carolina institution join the acc?
Columns: ['Institution', 'Nickname', 'Location', 'Founded', 'Joined ACC', 'School Type', 'ACC Football Titles']
Types: ['text', 'text', 'text', 'real', 'real', 'text', 'real']
Sample row: ['Boston College', 'Eagles', 'Chestnut Hill, Massachusetts', 1863.0, 2005.0, 'Private/Jesuit', 0.0]
SQL:

assistant: SELECT MAX("Joined ACC") FROM "Table" WHERE "Institution" = 'North Carolina';