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.

[Q]: Sentence: Particles of sand and rock are carried by longshore drift. Question: Particles of sand and what other substance are carried by longshore drift?
[A]: rock


[Q]: Sentence: Density describes how much matter is in a certain amount of space. Question: What describes how much matter is in a certain amount of space?
[A]: density


[Q]: Sentence: Echinoderms lack centralized nervous system type of system that in humans consists of the brain and spinal cord. Question: Echinoderms lack what type of system that in humans consists of the brain and spinal cord?
[A]:
centralized nervous system