Question: Which is the explosive material that was discovered by Alfred Nobel and starts with the letter d?
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q12870 . ?sbj wdt:P61 wd:Q23810 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'd')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25