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

### Instruction:
What is the smallest grid with a Time/Retired of engine, and a qual of less than 138.75?

### Inputs:
table_name: table, columns: ['Grid', 'Constructor', 'Qual', 'Rank', 'Laps', 'Time/Retired']

### Response:
SELECT MIN Grid FROM table WHERE Time/Retired = engine AND Qual < 138.75