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_40 (number_of_electorates__2009_ INTEGER, reserved_for___sc___st__none_ VARCHAR, name VARCHAR)

### Question ###
Name the Number of electorates (2009 which has a Reserved for ( SC / ST /None) of none, and a Name of jahanabad?

### Accurate SQL ###

SELECT MIN(number_of_electorates__2009_) FROM table_name_40 WHERE reserved_for___sc___st__none_ = "none" AND name = "jahanabad"