Question: What was the ranking, on 2016 Fortune 500 list,  of the insurance company which has Seymour G. Sternberg as its chairman ? 
Sentence (from "Lithia Motors"): This followed a year that saw the acquisition of the DCH Auto Group, one of the 10 largest dealer groups in the country, with 27 dealerships, before being purchased by Lithia Motors.
Relevant evidence: No