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: joint 
 Entity 2: associate muscle

SOLUTION: yes

PROBLEM: Entity 1: lava 
 Entity 2: skin

SOLUTION: no

PROBLEM: Entity 1: elephant 
 Entity 2: nose

SOLUTION:
yes