You will be given a definition of a task first, then some input of the task.
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 sealed, vacuum-insulated reaction flask approximates the condition of a isolated system, in which neither matter nor heat can be exchanged between system and surroundings. Question: A sealed, vacuum-insulated reaction flask approximates what condition, in which neither matter nor heat can be exchanged between system and surroundings?
Output:
isolated system