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_name_68 ( upstream VARCHAR, monthly_cap VARCHAR )

### Question ###
What is the upstream with a 150 gb monthly cap?

### Accurate SQL ###

SELECT upstream FROM table_name_68 WHERE monthly_cap = "150 gb"