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: A federated identity in information technology is the means of linking a person 's electronic identity and attributes , stored across multiple distinct identity management systems . 
 Question: what is  linking something?

SOLUTION: A federated identity in information technology ### the means

PROBLEM: Sentence: A Fifth order Fresnel lens manufactured by Parisian glass makers Barbier and Fenestre was installed in the lantern . 
 Question: where was something installed?

SOLUTION: in the lantern

PROBLEM: Sentence: The means to lay their foundation being the outcome of special prayers addressed to the Mother of God during the nine days preceding event of 8 Dec. , 1854 . 
 Question: what is  laid?

SOLUTION:
their foundation being the outcome of special prayers addressed to the Mother of God during the nine days preceding event of 8 Dec. , 1854 .