TASK DEFINITION: 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.
PROBLEM: Sentence: The psychological impact of this first transformation caused Beast to experience short-term amnesia and also made it difficult for him to control his animalistic instincts , which would cause him to slip into an uncontrollable berserker rage during combat . 
 Question: who   experienced something?

SOLUTION: Beast ### him

PROBLEM: 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: why did something collapse?

SOLUTION: under the weight of the rainwater

PROBLEM: Sentence: Originally the three women , Amy Saunders , Lou Bennett and Sally Dastey combined their vocal talents as backing singers for Aboriginal band Djaambi , led by Saunder 's brother Richard Frankland in 1990 . 
 Question: what was someone backing something for?

SOLUTION:
Aboriginal band Djaambi , led by Saunder 's brother Richard Frankland in 1990 .