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_91 ( tier VARCHAR, division VARCHAR, cup_competitions VARCHAR )

### Question ###
Which tier has a division of LEB 2 and Cup Competitions of Copa LEB Plata runner-up?

### Accurate SQL ###

SELECT tier FROM table_name_91 WHERE division = "leb 2" AND cup_competitions = "copa leb plata runner-up"