Which country's material was concrete when the span metres were less than 270, span feet is more than 837, and the year opened was 1943?
CREATE TABLE table_43214 (
    "Rank" real,
    "Name" text,
    "Span metres" real,
    "Span feet" real,
    "Material" text,
    "Year opened" text,
    "Country" text
)
SELECT "Country" FROM table_43214 WHERE "Material" = 'concrete' AND "Span metres" < '270' AND "Span feet" > '837' AND "Year opened" = '1943'
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 country's material was concrete when the span metres were less than 270, span feet is more than 837, and the year opened was 1943? ### Input: CREATE TABLE table_43214 (
    "Rank" real,
    "Name" text,
    "Span metres" real,
    "Span feet" real,
    "Material" text,
    "Year opened" text,
    "Country" text
) ### Response: SELECT "Country" FROM table_43214 WHERE "Material" = 'concrete' AND "Span metres" < '270' AND "Span feet" > '837' AND "Year opened" = '1943'