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: Single-celled organisms are prokaryotes. Question: What kind of organisms are prokaryotes?
single-celled

Sentence: Animals produce most of enzymes chemicals, which are needed to synthesize the fatty acids they need. Question: Animals produce most of what chemicals, which are needed to synthesize the fatty acids they need?
enzymes

Sentence: Varicose veins are veins that become enlarged because the valves no longer close properly. Question: Varicose veins are veins that become enlarged because the valves no longer do this?

close properly