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_27 (commercial_operation VARCHAR, construction_start VARCHAR)
### Question:
When was commercial operation where construction started June 10, 1971?
### Answer:
SELECT commercial_operation FROM table_name_27 WHERE construction_start = "june 10, 1971"