On what circuit was the GTU winning team #59 Brumos Porsche - Audi in round 5? 
CREATE TABLE table_13642023_2 (circuit VARCHAR, rnd VARCHAR, gtu_winning_team VARCHAR)
SELECT circuit FROM table_13642023_2 WHERE rnd = 5 AND gtu_winning_team = "#59 Brumos Porsche - Audi"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_13642023_2 (circuit VARCHAR, rnd VARCHAR, gtu_winning_team VARCHAR) Question: On what circuit was the GTU winning team #59 Brumos Porsche - Audi in round 5?  [/INST] SELECT circuit FROM table_13642023_2 WHERE rnd = 5 AND gtu_winning_team = "#59 Brumos Porsche - Audi" </s>