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.

Sentence: A neutron collides with an atom of u-235 during the basic nuclear fission process. Question: What type of particle collides with an atom of u-235 during the basic nuclear fission process?
a neutron

Sentence: Most of the heat that enters the mesosphere comes from the stratosphere. Question: Most of the heat that enters the mesosphere comes from where?
the stratosphere

Sentence: The passenger piegon once most common bird in north america became extinct in the 1800s. Question: What once most common bird in north america became extinct in the 1800s?

the passenger piegon