What patent medicine did John Pemberton invent that starts with the letter "c"?
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q3480271 . ?sbj wdt:P61 wd:Q215959 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'c')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
patent medicine: Q3480271 john pemberton: Q215959