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?). ",

Sentence: Then we use the spectral radius of the next generation matrix ( the method proposed by the Van Den Driessche in ( 1 ) ) to get the expression of R 0 of system ( 1 ). 
 Section: method
True

Sentence: We updated our PhiSpy algorithm to improve detection of prophages and to provide a web-based framework for PhiSpy. 
 Section: background
True

Sentence: U.S. Food and Drug Administration-approved vaccines do not exist for the prevention of arenavirus infection and effective antiviral therapies have been limited to the use of ribavirin for Lassa virus ( 4 ) or immune plasma for Junín virus ( 5 ). 
 Section: method

False