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: lactose 
 Entity 2: hydrogen gas
yes

Entity 1: cranium 
 Entity 2: trunk
no

Entity 1: urine 
 Entity 2: baking pan

no