Question: Tell me which one has the biggest area among the type of government that has the presidential system basic government form.
Choices: Colombia
Italy
Mozambique
Belarus
Namibia
Germany
Tunisia
Bolivia
Sierra Leone
Zambia
SPARQL: SELECT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "form of government" . ?e <basic_form_of_government> ?e_1 . ?e_1 <pred:name> "presidential system" .  ?e <area> ?pv . ?pv <pred:value> ?v .  } ORDER BY DESC(?v) LIMIT 1
Program:
function: Find
inputs: presidential system
function: Relate
dependencies: 0
inputs: basic form of government
backward
function: FilterConcept
dependencies: 1
inputs: form of government
function: SelectAmong
dependencies: 2
inputs: area
largest
Answer: Zambia