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: tracheal system 
 Entity 2: spiracle
yes

Entity 1: cup 
 Entity 2: vitamin
no

Entity 1: baby 
 Entity 2: pain receptor

no