Question: German is the native language of which person who took part in the 2004 Summer Olympics?
Choices: Adolf Hitler
Heather Mitts
Carmelo Anthony
Wolfgang Amadeus Mozart
Ludwig Wittgenstein
Max Fleischer
William Henry Harrison
Tim Duncan
Roger Federer
Sylvester Stallone
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "human" . ?e <participant_of> ?e_1 . ?e_1 <pred:name> "2004 Summer Olympics" .  ?e <native_language> ?e_2 . ?e_2 <pred:name> "German" .  }
Program:
function: Find
inputs: 2004 Summer Olympics
function: Relate
dependencies: 0
inputs: participant of
backward
function: FilterConcept
dependencies: 1
inputs: human
function: Find
inputs: German
function: Relate
dependencies: 3
inputs: native language
backward
function: FilterConcept
dependencies: 4
inputs: human
function: And
dependencies: 2
5
function: What
dependencies: 6
Answer: Roger Federer