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_87 (density__inhabitants_km_2__ INTEGER, city VARCHAR)
### Question:
What is the lowest density of serravalle scrivia?
### Answer:
SELECT MIN(density__inhabitants_km_2__) FROM table_name_87 WHERE city = "serravalle scrivia"