user: Question: What is the rank for Mar 17 when the April 21 rank is 10?
Columns: ['Poll', 'Pre- season', 'Mar 3', 'Mar 17', 'Mar 24', 'Mar 31', 'April 7', 'April 14', 'April 21', 'April 28', 'May 5', 'May 12', 'May 19', 'May 26', 'Final']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ["USA Today/ESPN Coaches' Poll", 'NR', 'NR', '24', '17', '10', '6', '9', '8', '7', '7', '6', '7', '10', '23']
SQL:

assistant: SELECT "Mar 17" FROM "Table" WHERE "April 21" = '10';