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_16388478_4 (home_team VARCHAR, away_team VARCHAR)

### Question ###
Who was the home team when the away team is Carlton?

### Accurate SQL ###

SELECT home_team FROM table_16388478_4 WHERE away_team = "Carlton"