user: Question: Which FA Cup Apps have League Apps of 21?
Columns: ['Name', 'Position', 'League Apps', 'League Goals', 'FA Cup Apps', 'FA Cup Goals', 'League Cup Apps', 'League Cup Goals', 'Total Apps', 'Total Goals']
Types: ['text', 'text', 'text', 'real', 'text', 'real', 'text', 'real', 'text', 'real']
Sample row: ['Terry Armstrong', 'FW', '4', 0.0, '0', 0.0, '0', 0.0, '4', 0.0]
SQL:

assistant: SELECT "FA Cup Apps" FROM "Table" WHERE "League Apps" = '21';