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 exhibition ( theme VARCHAR, YEAR VARCHAR, ticket_price INTEGER )

### Question ###
Show theme and year for all exhibitions with ticket prices lower than 15.

### Accurate SQL ###

SELECT theme, YEAR FROM exhibition WHERE ticket_price < 15