user: Question: What is the circuit on 19 Apr with Craig Lowndes as the winner?
Columns: ['Date', 'Series', 'Circuit', 'City / State', 'Winner', 'Team']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1 Feb', 'ATCC Round 1', 'Sandown International Raceway', 'Melbourne , Victoria', 'Craig Lowndes', 'Holden Racing Team']
SQL:

assistant: SELECT "Circuit" FROM "Table" WHERE "Winner" = 'Craig Lowndes' AND "Date" = '19 Apr';