2016 Boston Marathon
The 2016 Boston Marathon was the 120th running of the Boston Athletic Association's mass-participation marathon . 
<triplet> 2016 Boston Marathon <subj> Boston Athletic Association <obj> organizer <subj> mass-participation marathon <obj> instance of <triplet> mass-participation marathon <subj> 2016 Boston Marathon <obj> has part <subj> Boston Athletic Association <obj> organizer