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_2248991_2 ( world_rank VARCHAR, nation VARCHAR )

### Question ###
How many items were listed under world rank under the nation of Nigeria?

### Accurate SQL ###

SELECT COUNT(world_rank) FROM table_2248991_2 WHERE nation = "Nigeria"