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

### Instruction:
What was the class when adt champion racing ranked 1st with an audi r8 chassis, and less than 206 points?

### Inputs:
table_name: table, columns: ['Year', 'Entrant', 'Class', 'Chassis', 'Engine', 'Tyres', 'Rank', 'Points']

### Response:
SELECT Class FROM table WHERE Points < 206 AND Chassis = audi r8 AND Entrant = adt champion racing AND Rank = 1st