What is the {essential medicine} for {vaccine for} of {chickenpox}
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What is the essential medicinal ingredient in the chickenpox vaccine?
SELECT DISTINCT ?c WHERE { ?c property:vaccine_for resource:chickenpox . ?c rdf:type ontology:essential_medicine }
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1924> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q44727> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q35456> } 
 select distinct ?sbj where { ?sbj wdt:P1924 wd:Q44727 . ?sbj wdt:P31 wd:Q35456 } 
varicella vaccine