What is the {product} with the {MIN(consumption rate)} whose {topic's main category} is {Category:Petroleum}  ?
Which petroleum product has the lowest rate of consumption?
What petroleum product has the lowest consumption rate?
SELECT ?w WHERE { ?w property:topic's_main_category resource:Category:Petroleum . ?w property:consumption_rate ?m . ?w rdf:type ontology:product }
select ?ent where {
?ent <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q2424752>.

?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2292>.
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj1.

?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P910> .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q6572327> .

}
ORDER BY ASC(?obj1)
LIMIT 5
select ?ent where { ?ent wdt:P31 wd:Q2424752 . ?ent wdt:P2292 ?obj . ?ent wdt:P910 wd:Q6572327} ORDER BY ASC(?obj)LIMIT 5 
petroleum