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

### Instruction:
What is the subject when the highest mark is 79?

### Inputs:
table_name: table, columns: ['Subject', 'No. Sat', 'No. Passed', '% Pass', 'Highest mark', 'Lowest mark', 'Mean']

### Response:
SELECT Subject FROM table WHERE Highest mark = 79