Passage: Hurricane Rita formed as a tropical storm over the Turks and Caicos Islands on September 18. The storm reached Category 2 intensity as it moved south of the Florida Keys on September 20. Rapid intensification ensued as Rita moved into the Gulf of Mexico, and Rita became a Category 5 hurricane on September 21, becoming the third (now fourth) most intense hurricane ever recorded in the Atlantic Basin. Rita made landfall near the Texas-Louisiana border on September 24. Major flooding was reported in Port Arthur and Beaumont, Texas, while Cameron and Calcasieu parishes in Louisiana were devastated. Offshore oil platforms throughout Rita's path also suffered significant damage. Six people were killed by Rita's direct effects, and total damage from the storm was estimated at about $18.5 billion (2005 USD). One hundred and thirteen indirect deaths were reported, mostly from the exodus from Houston, Texas and surrounding counties.Tropical Depression Nineteen formed west of the Cape Verde Islands on September 30 but dissipated on October 2 without having threatened land.

Question: What was the maximum hurricane category that Rita reached?
5