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_37 (watts INTEGER, city_of_license VARCHAR, class VARCHAR, frequency VARCHAR)

### Question ###
How many Watts has a Class of a, and a Frequency of 91.5 fm, and a City of license of elkhart, kansas?

### Accurate SQL ###

SELECT MIN(watts) FROM table_name_37 WHERE class = "a" AND frequency = "91.5 fm" AND city_of_license = "elkhart, kansas"