user: Question: What is the i/o bus for the brand name Core i3-21xx?
Columns: ['Codename (main article)', 'Brand name (list)', 'Cores', 'L3 Cache', 'Socket', 'TDP', 'I/O Bus']
Types: ['text', 'text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['Sandy Bridge (Desktop)', 'Core i3-21xx', 2.0, '3 MB', 'LGA 1155', '65 W', 'Direct Media Interface , Integrated GPU']
SQL:

assistant: SELECT "I/O Bus" FROM "Table" WHERE "Brand name (list)" = 'Core i3-21xx';