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).

Q: carbonate water

A: dioxide
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Q: bloodroot flower

A: petal
****
Q: two lung

A:
balloon - air sacs
****