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_55789 ( "Ordinary income rate" text, "Long-term capital gain rate" text, "Short-term capital gain rate" text, "Long-term gain on commercial buildings*" text, "Long-term gain on collectibles" text )

### Question ###
What long-term gain for collectibles coincides with ordinary income rate 15%?

### Accurate SQL ###

SELECT "Long-term gain on collectibles" FROM table_55789 WHERE "Ordinary income rate" = '15%'