Question: Which hydrogen fluoride s used as standard System for the Identification of the Hazards of Materials for Emergency Response
Paraphrase: Identification of the Hazards of Materials for Emergency Response's standard system is which Hydrogen Fluoride?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q2468 p:P4952 ?s . ?s ps:P4952 wd:Q51139288 . ?s pq:P995 ?value}