Given two entities as input, classify as "yes" if second entity is the part of the first entity. Otherwise classify them as "no". These are entities of meronym In linguistics, meronymy is a semantic relation between a meronym denoting a part and a holonym denoting a whole. In simpler terms, a meronym (i.e., second entity) is in a part-of relationship with its holonym (i.e., first entity).

Entity 1: fen 
 Entity 2: underground stem
no

Entity 1: nutria 
 Entity 2: incisor
yes

Entity 1: organism 
 Entity 2: biological activity

yes