instruction:
In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.
question:
Sentence: Bicarbonate ions protects tissues of the central nervous system from changes in ph. Question: What protects tissues of the central nervous system from changes in ph?
answer:
bicarbonate ions


question:
Sentence: Excessive bending stress usually causes fractures on a bone. Question: What usually causes fractures on a bone?
answer:
excessive bending stress


question:
Sentence: If an elephant and a boy are falling towards the ground, both same time will land first. Question: If an elephant and a boy are falling towards the ground, who will land first?
answer:

both same time