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 question which can be answered using the sentence. Your task is to answer the question using the information from the sentence. The answer to the question is unique and it is a continuous text span from the sentence.

Sentence: The storm caused extensive damage to West Edmonton Mall ; a small glass section of the roof collapsed under the weight of the rainwater , causing water to drain onto the mall 's indoor ice rink . 
 Question: what   collapsed?
Output:
a small glass section of the roof