Question: Name a nonmetal discovered in England  that starts with letter O
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q19600 . ?sbj wdt:P189 wd:Q21 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'o')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25