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

### Instruction:
What is the range of the head of household whereas single is $171,551–$372,950?

### Inputs:
table_name: table, columns: ['Marginal Ordinary Income Tax Rate', 'Single', 'Married Filing Jointly or Qualified Widow(er)', 'Married Filing Separately', 'Head of Household']

### Response:
SELECT Head of Household FROM table WHERE Single = $171,551–$372,950