Question: Which human uses the language that has an IETF language tag of ps?
Choices: Vittorio Storaro
Chet Atkins
John Stephenson
Marisa Tomei
Bernardo Bertolucci
Aditya Chopra
Naya Rivera
Vadivelu
Georg Wilhelm Friedrich Hegel
Claudia Schiffer
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "human" . ?e <languages_spoken,_written_or_signed> ?e_1 . ?e_1 <pred:instance_of> ?c_1 . ?c_1 <pred:name> "language" . ?e_1 <IETF_language_tag> ?pv . ?pv <pred:value> "ps" .   }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: IETF language tag
ps
function: FilterConcept
dependencies: 1
inputs: language
function: Relate
dependencies: 2
inputs: languages spoken, written or signed
backward
function: FilterConcept
dependencies: 3
inputs: human
function: What
dependencies: 4
Answer: John Stephenson