user: Question: Name the name for 15 yield
Columns: ['Date (GMT)', 'Yield (megatons)', 'Deployment', 'Country', 'Test Site', 'Name or Number']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['October 30, 1961', '50', 'parachute air drop', 'Soviet Union', 'Novaya Zemlya', 'Tsar Bomba , Test #130']
SQL:

assistant: SELECT "Name or Number" FROM "Table" WHERE "Yield (megatons)" = '15';