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: horse 
 Entity 2: chemical
no

Entity 1: breast cancer 
 Entity 2: mucus
no

Entity 1: sporophyte 
 Entity 2: stomata

yes