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_18899 ( "Rnd" real, "Circuit" text, "GTO Winning Team" text, "GTU Winning Team" text, "TO Winning Team" text, "TU Winning Team" text, "Results" text )

### Question ###
What was the gtu winning team when the gto winning team was #48 greenwood racing?

### Accurate SQL ###

SELECT "GTU Winning Team" FROM table_18899 WHERE "GTO Winning Team" = '#48 Greenwood Racing'