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_50295 ( "Parameter" text, "1st stage" text, "2nd stage" text, "3rd stage" text, "4th stage" text )

### Question ###
What is the Parameter that has the third phase of 20kn?

### Accurate SQL ###

SELECT "Parameter" FROM table_50295 WHERE "3rd stage" = '20kn'