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

### Instruction:
What is the prime mover for a build date in 1975?

### Inputs:
table_name: table, columns: ['Model', 'Build date', 'Total produced', 'Wheel arrangement', 'Prime mover', 'Power output']

### Response:
SELECT Prime mover FROM table WHERE Build date = 1975