user: Question: Which League Cup has a FA Cup of 5, and a Club of boston united, and a League smaller than 16?
Columns: ['Player', 'Club', 'League', 'FA Cup', 'FA Trophy', 'League Cup', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Gary Bull', 'Barnet', 30.0, 2.0, 0.0, 0.0, 32.0]
SQL:

assistant: SELECT "League Cup" FROM "Table" WHERE "FA Cup" = 5.0 AND "Club" = 'boston united' AND "League" < 16.0;