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: birch 
 Entity 2: protein matter
no

Entity 1: polymorphism 
 Entity 2: enzyme
no

Entity 1: brain 
 Entity 2: current

yes