Question: Early 20th-century American novelist Upton Sinclair explores socialist themes in King Coal and which earlier work based in Chicago?
Sentence (from "The Jungle"): However, most readers were more concerned with his exposure of health violations and unsanitary practices in the American meatpacking industry during the early 20th century, greatly contributing to a public outcry which led to reforms including the Meat Inspection Act.
Relevant evidence: No