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_15162503_1 (description VARCHAR, viewers_selection VARCHAR)

### Question ###
What was the description when the viewers selected Nan?

### Accurate SQL ###

SELECT description FROM table_15162503_1 WHERE viewers_selection = "Nan"