Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What was the date of Circuit Hockenheimring and the winning manufacturer being Mercedes-Benz?

### Inputs:
table_name: table, columns: ['Round', 'Circuit', 'Date', 'Fastest lap', 'Winning driver', 'Winning team', 'Winning manufacturer']

### Response:
SELECT Date FROM table WHERE Circuit = hockenheimring AND Winning manufacturer = mercedes-benz