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

### Instruction:
Which Class has a Frequency MHz larger than 91.7, and a Call sign of k272ec?

### Inputs:
table_name: table, columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'Class', 'FCC info']

### Response:
SELECT Class FROM table WHERE Frequency MHz > 91.7 AND Call sign = k272ec