[{'role': 'system', 'content': "You are an expert in machine learning and your task is to classify code snippets into one of the following categories: ['helper_functions', 'load_data', 'data_exploration', 'data_preprocessing', 'evaluation', 'modelling', 'prediction', 'result_visualization', 'save_results', 'comment_only']."}, {'role': 'user', 'content': "Identify the single most appropriate category to which the provided code belongs. Provide your response as a single category label without any additional information, commentary, or personal opinions.\\nPython Code:# Forbered aflevering \ndftest.drop(['Dayofyear',\n       'Expo','FatalityPct2', 'Factor',\n       'ConfirmedCases_base', 'ConfirmedCases_init',\n       'NewCases_base', 'Fatalities_init', 'FatalityBasis',\n       'ConfirmedCases_shift',\n       'NewCases', 'NewCases_cum', 'NewFatalities','NewFatalities_cum'],axis=1,inplace=True)\nfinal = dftest.groupby(['Country_Region','Province_State']).tail(1)\ndftest.drop(['Province_State'],axis=1,inplace=True)\ndftest.rename(columns={'Province_State_orig':'Province_State'},inplace=True)"}, {'role': 'assistant', 'content': 'data_preprocessing'}]