Given an entity as input, output another entity which is part of the input entity. 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., output entity) is in a part-of relationship with its holonym (i.e., input entity).

[EX Q]: single-celled or multicellular organisms
[EX A]: cell wall

[EX Q]: dark chocolate
[EX A]: cocoa butter

[EX Q]: float cloud
[EX A]:
vapor