What is the {isotope of lead} with the {MIN(mass excess)} whose {decays to} is {thallium-185}  ?
Which lead isotope has the least excess mass declining to thallium-185?
Which isotope of lead has the least mass excess which decays to thallium-185?
SELECT ?v WHERE { ?v property:decays_to resource:thallium-185 . ?v rdf:type ontology:isotope_of_lead . ?v property:mass_excess ?b }
select ?ent where {
?ent <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q1372384>.

?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/P2160>.
?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/P816> .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q18883276> .

}
ORDER BY ASC(?obj1)
LIMIT 5
select ?ent where { ?ent wdt:P31 wd:Q1372384 . ?ent wdt:P2160 ?obj . ?ent wdt:P816 wd:Q18883276} ORDER BY ASC(?obj)LIMIT 5 
lead-185