In this task, you are given a sentence from the research paper and your task is to classify the given sentence into the following 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?). 

Example Input: has been widely used as a pharmacological tool in preclinical studies to inform on CEACAM1 pathway biology although limited data are available on its CEACAM1 blocking characteristics or pharmacodynamic-pharmacokinetic profiles.
Example Output: background

Example Input: we estimate IFR and CFR in China to be 0.5 % ( 95 % CI : 0.2-1.2 % ) and 1.1 % ( 95 % CI : 0.3-2.4 % ) respectively.
Example Output: finding

Example Input: Analyses of amino acids substitutions of the S protein sequences identified substitutions specific for genotype F strains circulating among European people.
Example Output:
finding