[{'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:all_data[all_data['Country_Region']=='Spain'].iloc[40:50][['Id', 'Province_State', 'Country_Region', 'Date',\n       'ConfirmedCases', 'Fatalities', 'ForecastId', 'Day_num', 'ConfirmedCases_1',\n       'ConfirmedCases_2', 'ConfirmedCases_3', 'Fatalities_1', 'Fatalities_2',\n       'Fatalities_3']]"}, {'role': 'assistant', 'content': 'data_preprocessing'}]