Name an academic writing author that starts with letter O
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:/instance of/ wd:/academic writing/ . ?sbj wdt:/author/ wd:/Charles Darwin/ . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'o')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 