Which isotope of antihydrogen with a gravitational interaction has the smallest electric charge ?
select ?ent where { ?ent wdt:P31 wd:Q31804375 . ?ent wdt:P2200 ?obj . ?ent wdt:P517 wd:Q11412} ORDER BY ASC(?obj)LIMIT 5 
isotope of antihydrogen: Q31804375 gravity: Q11412