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_name_42 (gdp_in_$id_b VARCHAR, city VARCHAR)
### Question:
What is the GDP $IDB in Istanbul?
### Answer:
SELECT gdp_in_$id_b FROM table_name_42 WHERE city = "istanbul"