Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_855 ( "Rnd" real, "Circuit" text, "GTP Winning Team" text, "GTO Winning Team" text, "GTU Winning Team" text, "Results" text )

### Question ###
What was the GTP winning team in the round in Portland during which Jack Baldwin become part of the GTU winning team?

### Accurate SQL ###

SELECT "GTP Winning Team" FROM table_855 WHERE "Circuit" = 'Portland' AND "GTU Winning Team" = 'Jack Baldwin'