Question: Of medicines that are Pyrus nutrients, which possesses the lowest atomic number?
Choices: Chakri Dynasty
Constantine
analgesic
copper
The Phantom of the Opera
iron
prescription drug
antibiotic
Assam
over-the-counter drug
SPARQL: SELECT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "medication" . ?e_1 <nutrient> ?e . ?e_1 <pred:name> "Pyrus" .  ?e <atomic_number> ?pv . ?pv <pred:value> ?v .  } ORDER BY ?v LIMIT 1
Program:
function: Find
inputs: Pyrus
function: Relate
dependencies: 0
inputs: nutrient
forward
function: FilterConcept
dependencies: 1
inputs: medication
function: SelectAmong
dependencies: 2
inputs: atomic number
smallest
Answer: iron