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_27108 ( "Episode Number" real, "Location" text, "Original Airdate" text, "Challenge Winner" text, "Challenge" text )

### Question ###
What was the challenge for episode 28?

### Accurate SQL ###

SELECT "Challenge" FROM table_27108 WHERE "Episode Number" = '28'