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_name_9 (best_score INTEGER, worst_dancer VARCHAR, worst_score VARCHAR)

### Question ###
What dance was Leeza Gibbons the worst dancer for, receiving a score lower than 15?

### Accurate SQL ###

SELECT MIN(best_score) FROM table_name_9 WHERE worst_dancer = "leeza gibbons" AND worst_score < 15