Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_1691800_2 (income_class VARCHAR, area__km²_ VARCHAR)
### Question:
what is the income class for area 75?
### Answer:
SELECT income_class FROM table_1691800_2 WHERE area__km²_ = 75