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_48645 ( "Discipline" text, "Circuit" text, "Event" text, "Session" text, "Cause" text )

### Question ###
The 1977 Japanese Grand Prix in the open wheel discipline has what session?

### Accurate SQL ###

SELECT "Session" FROM table_48645 WHERE "Discipline" = 'open wheel' AND "Event" = '1977 japanese grand prix'