Context: Rap impresario Dr andre young jr dr dre . Dre 's 20-year - old son was found dead over the weekend in his Woodland Hills home , coroner 's officials said . TOXICOLOGY TEST ORDERED FOR DR . DRE 'S SON : Autopsy alone could not determine cause of death andre young jr .
Question: Why are they testing the young man 's blood ?
Option 0: For a work drug - screen .
Option 1: For immunization purposes .
Option 2: None of the above choices .
Option 3: For a cause of death .
Answer: 3