What is the scientific pitch when the Helmholtz pitch is D?
CREATE TABLE table_77931 (
    "String" text,
    "Scientific pitch" text,
    "Helmholtz pitch" text,
    "Interval from middle C" text,
    "Frequency ( Hz )" real
)
SELECT "Scientific pitch" FROM table_77931 WHERE "Helmholtz pitch" = 'd'
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: What is the scientific pitch when the Helmholtz pitch is D? ### Input: CREATE TABLE table_77931 (
    "String" text,
    "Scientific pitch" text,
    "Helmholtz pitch" text,
    "Interval from middle C" text,
    "Frequency ( Hz )" real
) ### Response: SELECT "Scientific pitch" FROM table_77931 WHERE "Helmholtz pitch" = 'd'