Who wrote the episode that aired on April 17, 2011?
CREATE TABLE table_16467 (
    "No. in season" real,
    "No. in series" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "U.S. viewers (million)" text
)
SELECT "Written by" FROM table_16467 WHERE "Original air date" = 'April 17, 2011'
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 wrote the episode that aired on April 17, 2011? ### Input: CREATE TABLE table_16467 (
    "No. in season" real,
    "No. in series" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "U.S. viewers (million)" text
) ### Response: SELECT "Written by" FROM table_16467 WHERE "Original air date" = 'April 17, 2011'