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_28138035_15 ( womens_singles VARCHAR, mens_singles VARCHAR )

### Question ###
Who won Womens Singles in the year that Ma Lin won Mens Singles?

### Accurate SQL ###

SELECT womens_singles FROM table_28138035_15 WHERE mens_singles = "Ma Lin"