Who had most laps led at Chicagoland speedway? 
CREATE TABLE table_2454550_1 (most_laps_led VARCHAR, track VARCHAR)
SELECT most_laps_led FROM table_2454550_1 WHERE track = "Chicagoland Speedway"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_2454550_1 (most_laps_led VARCHAR, track VARCHAR) Question: Who had most laps led at Chicagoland speedway?  [/INST] SELECT most_laps_led FROM table_2454550_1 WHERE track = "Chicagoland Speedway" </s>