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: rock 
 Entity 2: thorium

SOLUTION: yes

PROBLEM: Entity 1: ray 
 Entity 2: substance

SOLUTION: no

PROBLEM: Entity 1: cell 
 Entity 2: bristle

SOLUTION:
no