user: Question: On what circuit was the I Mexican Grand Prix held?
Columns: ['Race Name', 'Circuit', 'Date', 'Winning driver', 'Constructor', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['V Cape Grand Prix', 'Killarney', '2 January', 'Trevor Taylor', 'Lotus - Climax', 'Report']
SQL:

assistant: SELECT "Circuit" FROM "Table" WHERE "Race Name" = 'I Mexican Grand Prix';