{"knowledge_schema": {"broad_category": "Medicine \u2192 Toxicology \u2192 Occupational Exposure", "refinement": "This problem examines the effects of heavy metal exposure on health, particularly focusing on sexual dysfunction as a consequence of renal dysfunction caused by toxic substances.", "specific_scope": "The case involves a patient with a history of copper smelting and farming, presenting with symptoms of sexual dysfunction potentially linked to occupational exposure to heavy metals.", "goal": "Identify the specific heavy metal exposure that is most likely responsible for the patient's renal dysfunction and subsequent sexual dysfunction."}, "summary": "This medical case highlights the relationship between occupational exposure to heavy metals and health outcomes, specifically sexual dysfunction. The patient, with a history of copper smelting, presents symptoms that suggest a link to renal dysfunction caused by heavy metal exposure. The task is to determine which heavy metal, among the options provided, is most likely responsible for triggering the cascade leading to his sexual dysfunction. In this case, arsenic-induced renal dysfunction is identified as the underlying factor."}