Which Field has a Discovery of na, and an Operator(s) of woc, and a Geological Trend of western
CREATE TABLE table_15219 (
    "Field" text,
    "Geological Trend" text,
    "Reserves" text,
    "Discovery" text,
    "Operator(s)" text
)
SELECT "Field" FROM table_15219 WHERE "Discovery" = 'na' AND "Operator(s)" = 'woc' AND "Geological Trend" = 'western'
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: Which Field has a Discovery of na, and an Operator(s) of woc, and a Geological Trend of western ### Input: CREATE TABLE table_15219 (
    "Field" text,
    "Geological Trend" text,
    "Reserves" text,
    "Discovery" text,
    "Operator(s)" text
) ### Response: SELECT "Field" FROM table_15219 WHERE "Discovery" = 'na' AND "Operator(s)" = 'woc' AND "Geological Trend" = 'western'