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: A previously healthy man in his 20s developed unilateral testicular pain and swelling. 
 Section: background

SOLUTION: True

PROBLEM: 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

SOLUTION: True

PROBLEM: Sentence: FAdV-4 caused the depletion of lymphocytes and subsequent growth impairment in the thymus and bursa. 
 Section: method

SOLUTION:
False