What is the methyl red reading for the species that tests positive for indole?
CREATE TABLE table_39979 (
    "Species" text,
    "Indole" text,
    "Methyl Red" text,
    "Voges-Proskauer" text,
    "Citrate" text
)
SELECT "Methyl Red" FROM table_39979 WHERE "Indole" = 'positive'
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 methyl red reading for the species that tests positive for indole? ### Input: CREATE TABLE table_39979 (
    "Species" text,
    "Indole" text,
    "Methyl Red" text,
    "Voges-Proskauer" text,
    "Citrate" text
) ### Response: SELECT "Methyl Red" FROM table_39979 WHERE "Indole" = 'positive'