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_85 ( charter_range VARCHAR, school VARCHAR )

### Question ###
What are the active dates for the Montana State University chapter?

### Accurate SQL ###

SELECT charter_range FROM table_name_85 WHERE school = "montana state university"