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_2528382_2 ( year VARCHAR, co_stars VARCHAR )

### Question ###
In which years are co-stars mala sinha and amitabh bachchan?

### Accurate SQL ###

SELECT year FROM table_2528382_2 WHERE co_stars = "Mala Sinha and Amitabh Bachchan"