Question: Who is the pianist Roger Keith Barrett?
Choices: Robin Gibb
William Henry Harrison
Richard Gere
Syd Barrett
Maurice Gibb
Ray Manzarek
Brian Jones
Mick Jagger
Jack Nitzsche
Sylvester Stallone
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "human" . ?e <birth_name> ?pv . ?pv <pred:value> "Roger Keith Barrett" . ?e <instrument> ?e_1 . ?e_1 <pred:name> "piano" .  }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: birth name
Roger Keith Barrett
function: FilterConcept
dependencies: 1
inputs: human
function: Find
inputs: piano
function: Relate
dependencies: 3
inputs: instrument
backward
function: FilterConcept
dependencies: 4
inputs: human
function: And
dependencies: 2
5
function: What
dependencies: 6
Answer: Syd Barrett