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 Drama_Workshop_Groups ( Marketing_Region_Code VARCHAR )

### Question ###
What is the marketing region code that has the most drama workshop groups?

### Accurate SQL ###

SELECT Marketing_Region_Code FROM Drama_Workshop_Groups GROUP BY Marketing_Region_Code ORDER BY COUNT(*) DESC LIMIT 1