How many entries are in barony when the townland is derrigra?
CREATE TABLE table_31515 (
    "Townland" text,
    "Area( acres )" real,
    "Barony" text,
    "Civil parish" text,
    "Poor law union" text
)
SELECT COUNT("Barony") FROM table_31515 WHERE "Townland" = 'Derrigra'
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: How many entries are in barony when the townland is derrigra? ### Input: CREATE TABLE table_31515 (
    "Townland" text,
    "Area( acres )" real,
    "Barony" text,
    "Civil parish" text,
    "Poor law union" text
) ### Response: SELECT COUNT("Barony") FROM table_31515 WHERE "Townland" = 'Derrigra'