user: ### NOW ANSWER:
Question: What is the range of the head of household whereas single is $171,551–$372,950?
Columns: ['Marginal Ordinary Income Tax Rate', 'Single', 'Married Filing Jointly or Qualified Widow(er)', 'Married Filing Separately', 'Head of Household']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['10%', '$0–$8,350', '$0–$16,700', '$0–$8,350', '$0–$11,950']
SQL:

assistant: SELECT "Head of Household" FROM "Table" WHERE "Single" = '$171,551–$372,950';