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_2538117_7 (founding_date VARCHAR, founding_university VARCHAR)

### Question ###
If the founding university is in Washington, D.C., what was the founding date?

### Accurate SQL ###

SELECT founding_date FROM table_2538117_7 WHERE founding_university = "Washington, D.C."