Given a statement and question, generate the answer to the question such that the answer is contained in the statement.

[Q]: statement: Hydrogen and oxygen are essential for all life on earth, question: What is essential for all life on earth?
[A]: oxygen


[Q]: statement: Sports requires a lot of calories, question: How much calories does sports require?
[A]: a lot


[Q]: statement: Most liverworts are not large in size., question: What is not large in size?
[A]:
liverworts