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_38 (version INTEGER, release_date VARCHAR)
### Question:
What is the highest Version, when Release Date is "2011-04-01"?
### Answer:
SELECT MAX(version) FROM table_name_38 WHERE release_date = "2011-04-01"