Who directed the episode that was viewed by 2.50 million people in the U.S.?
CREATE TABLE table_11820086_1 (
    directed_by VARCHAR,
    us_viewers__millions_ VARCHAR
)
SELECT directed_by FROM table_11820086_1 WHERE us_viewers__millions_ = "2.50"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Who directed the episode that was viewed by 2.50 million people in the U.S.? ### Input: CREATE TABLE table_11820086_1 (
    directed_by VARCHAR,
    us_viewers__millions_ VARCHAR
) ### Response: SELECT directed_by FROM table_11820086_1 WHERE us_viewers__millions_ = "2.50"