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?). 

Input: Consider Input: The purpose of this investigation was to enhance our understanding of EV-D68 epidemiology and clinical features.

Output: purpose


Input: Consider Input: both theoretical and managerial applicability of the proposed stage-based model are empirically verified in this study.

Output: method


Input: Consider Input: with the specific aim of evaluating the association between PI and health status of calves within 30 days of age under field conditions.


Output: purpose