TASK DEFINITION: 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).
PROBLEM: Entity 1: human body 
 Entity 2: melanin

SOLUTION: yes

PROBLEM: Entity 1: earth 
 Entity 2: iron - nickel

SOLUTION: yes

PROBLEM: Entity 1: redfish 
 Entity 2: tail

SOLUTION:
yes