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_25518547_4 (affiliation VARCHAR, mls_team VARCHAR)

### Question ###
What university is houston dynamo affiliated with?

### Accurate SQL ###

SELECT affiliation FROM table_25518547_4 WHERE mls_team = "Houston Dynamo"