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_89 (time INTEGER, year VARCHAR, event VARCHAR)
### Question:
What is the greatest Time with a Year of 1991, and Event of 4x100 m relay?
### Answer:
SELECT MAX(time) FROM table_name_89 WHERE year = 1991 AND event = "4x100 m relay"