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: Combustion reaction occurs when a substance reacts quickly with oxygen. Question: What occurs when a substance reacts quickly with oxygen?
combustion reaction

Sentence: Mitosis actually occurs in four phases. Question: Mitosis actually occurs in how many phases?
four

Sentence: Natural convection is driven by buoyant forces. Question: Natural convection is driven by what forces?
buoyant