Question: What is cast member Alex Kingston's character role in Doctor Who (which has Penelope Wilton as a cast member)?
Choices: Irina Derevko
Granny
Raiden
Alonzo Harris
Jumba Jookiba
Dwight McCarthy
Mr. Sykes
Amy
Grouchy Smurf
River Song
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e_1 <pred:name> "Doctor Who" . ?e_1 <cast_member> ?e_3 . ?e_3 <pred:name> "Penelope Wilton" . ?e_2 <pred:name> "Alex Kingston" . ?e_1 <cast_member> ?e_2 . [ <pred:fact_h> ?e_1 ; <pred:fact_r> <cast_member> ; <pred:fact_t> ?e_2 ] <character_role> ?qpv .  }
Program:
function: Find
inputs: Penelope Wilton
function: Relate
dependencies: 0
inputs: cast member
backward
function: Find
inputs: Doctor Who
function: And
dependencies: 1
2
function: Find
inputs: Alex Kingston
function: QueryRelationQualifier
dependencies: 3
4
inputs: cast member
character role
Answer: River Song