In this task, you are given a sentence from the research paper and the category to which it belongs. Your task is to classify whether the given category is correct or not by providing "True" and "False", respectively. Here are the definitions for the categories: Background (Why is this problem important? What relevant works have been created before? What is still missing in the previous works? What are the high-level research questions? How might this help other research or researchers?), Purpose (What specific things do the researchers want to do? What specific knowledge do the researchers want to gain? What specific hypothesis do the researchers want to test?), Method (How did the researchers do the work or find what they sought? What are the procedures and steps of the research?), or Finding (What did the researchers find out? Did the proposed methods work? Did the thing behave as the researchers expected?). ",

Q: Sentence: Here , it is discussed that phenformin ( phenylethyl biguanide ) is a model for recruitment of endogenous Zn 21 to inhibit CysHis/CysHis ( X ) peptidolysis. 
 Section: purpose

A: True
****
Q: Sentence: These data provide a comprehensive basis for validating ( or not ) laboratory mice as a useful and relevant immunological model system. 
 Section: finding

A: True
****
Q: Sentence: The results showed that IBVs in China came from genetic changes both in IBV populations that existed before the advent of vaccination and in the viruses that were introduced through live vaccines. 
 Section: finding

A:
True
****