What patent medicine did John Pemberton invent that starts with the letter "c"?
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:/instance of/ wd:/patent medicine/ . ?sbj wdt:/discoverer or inventor/ wd:/John Pemberton/ . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'c')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 