Question: What disease did John Hartford die of ?
Choices: leukemia
multiple sclerosis
prostate cancer
testicular cancer
attention deficit hyperactivity disorder
gastroesophageal reflux disease
heart failure
acute cystitis
lymphoma
epilepsy
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "disease" . ?e_1 <cause_of_death> ?e . ?e_1 <pred:name> "John Hartford" .   }
Program:
function: Find
inputs: John Hartford
function: Relate
dependencies: 0
inputs: cause of death
forward
function: FilterConcept
dependencies: 1
inputs: disease
function: What
dependencies: 2
Answer: lymphoma