What is the earliest year that had a Lotus 49B chassis?
CREATE TABLE table_name_73 (year INTEGER, chassis VARCHAR)
SELECT MIN(year) FROM table_name_73 WHERE chassis = "lotus 49b"
### Context: CREATE TABLE table_name_73 (year INTEGER, chassis VARCHAR) ### Question: What is the earliest year that had a Lotus 49B chassis? ### Answer: SELECT MIN(year) FROM table_name_73 WHERE chassis = "lotus 49b"