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.
Q: Sentence: The distinction between Primary and Secondary groups serves to identify between two orders of social organisation through analysis of the group relationships and their nature . 
 Question: what   serves  for something?
A: 
The distinction between Primary and Secondary groups