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: Diffusion is the process in which a substance naturally moves from an area of higher to lower concentration. Question: What is the process in which a substance naturally moves from an area of higher to lower concentration called?
answer:
diffusion


question:
Sentence: Stationary front weather phenomenon, which may bring clouds and precipitation, is created by stalled air masses. Question: What weather phenomenon, which may bring clouds and precipitation, is created by stalled air masses?
answer:
stationary front


question:
Sentence: Coal is the source of most electricity. Question: What is the source of most electricity?
answer:

coal