What is the result for salmonella spp. if you use citrate?
CREATE TABLE table_20540 (
    "Species" text,
    "Indole" text,
    "Methyl Red" text,
    "Voges-Proskauer" text,
    "Citrate" text
)
SELECT COUNT("Citrate") FROM table_20540 WHERE "Species" = 'Salmonella spp.'
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 result for salmonella spp. if you use citrate? ### Input: CREATE TABLE table_20540 (
    "Species" text,
    "Indole" text,
    "Methyl Red" text,
    "Voges-Proskauer" text,
    "Citrate" text
) ### Response: SELECT COUNT("Citrate") FROM table_20540 WHERE "Species" = 'Salmonella spp.'