What is the {essential medicine} for {drug used for treatment} of {mental disorder}
What prescription is fundamental for the treatment of mental issue?
What medicine is essential for the treatment of mental disorders?
SELECT DISTINCT ?q WHERE { ?q rdf:type ontology:essential_medicine . resource:mental_disorder property:drug_used_for_treatment ?q }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q12135> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2176> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q35456> } 
 select distinct ?obj where { wd:Q12135 wdt:P2176 ?obj . ?obj wdt:P31 wd:Q35456 } 
clozapine haloperidol lamotrigine risperidone fluoxetine