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

### Instruction:
What categories had a Nominated work of yerma before 1992?

### Inputs:
table_name: table, columns: ['Year', 'Award', 'Category', 'Nominated work', 'Result']

### Response:
SELECT Category FROM table WHERE Year < 1992 AND Nominated work = yerma