Question: Which TV station's headquarters is in Silver Spring, at zip code 20910?
Choices: Channel 4
CTV Television Network
ESPN
Discovery Channel
CITV
Munhwa Broadcasting Corporation
TV Asahi
NBC
Univision
Korean Broadcasting System
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "television station" . ?e <headquarters_location> ?e_1 . ?e_1 <pred:name> "Silver Spring" .  [ <pred:fact_h> ?e ; <pred:fact_r> <headquarters_location> ; <pred:fact_t> ?e_1 ] <postal_code> ?qpv . ?qpv <pred:value> "20910" .  }
Program:
function: Find
inputs: Silver Spring
function: Relate
dependencies: 0
inputs: headquarters location
backward
function: QFilterStr
dependencies: 1
inputs: postal code
20910
function: FilterConcept
dependencies: 2
inputs: television station
function: What
dependencies: 3
Answer: Discovery Channel