TASK DEFINITION: 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?). ",
PROBLEM: Sentence: have different recent origins corresponding to multiple re-introduction events of viral strains that were circulating in neighbor countries. 
 Section: purpose

SOLUTION: False

PROBLEM: Sentence: The kinetic analyses carried out in the present study reflect that in utero infection with PRRSV modulates immune cell populations in peripheral blood and BALF of surviving piglets. 
 Section: purpose

SOLUTION: False

PROBLEM: Sentence: In this article , four recombinant viruses that expressed GP5 and M proteins of PRRSV in the modified vaccinia virus ankara ( MVA ) with different expression patterns were made. 
 Section: method

SOLUTION:
True