What is the short-chain fatty acid with the lowest surface tension that is part carbon?
select ?ent where { ?ent wdt:P31 wd:Q2698455 . ?ent wdt:P3013 ?obj . ?ent wdt:P527 wd:Q623. } ORDER BY ASC(?obj)LIMIT 5 
short-chain fatty acid: Q2698455 carbon: Q623