user: Question: What is the group C region with Illinois as group B?
Columns: ['Region', 'Group A', 'Group B', 'Group C', 'Group D', 'Group E', 'Group F']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Maine New Hampshire Vermont', 'Massachusetts', 'Connecticut Rhode Island', 'Delaware New Jersey', 'New York', 'Pennsylvania']
SQL:

assistant: SELECT "Group C" FROM "Table" WHERE "Group B" = 'Illinois';