
    In a hospital's patient monitoring system, given a list of patient records where each record contains a patient ID and their calculated readmission risk score, identify the ID of the patient with the lowest risk score. The risk scores are calculated based on patients' medical history and current vital signs, and lower scores indicate better health outcomes.
    

    
from operator import itemgetter

def index_minimum(test_list):
    """
    In a hospital's patient monitoring system, given a list of patient records where each record contains a patient ID and their calculated readmission risk score, identify the ID of the patient with the lowest risk score. The risk scores are calculated based on patients' medical history and current vital signs, and lower scores indicate better health outcomes.
    

    """
from operator import itemgetter

def index_minimum(test_list):
    """
    In a hospital's patient monitoring system, given a list of patient records where each record contains a patient ID and their calculated readmission risk score, identify the ID of the patient with the lowest risk score. The risk scores are calculated based on patients' medical history and current vital signs, and lower scores indicate better health outcomes.
    

    """
    res = min(test_list, key=itemgetter(1))[0]
    return res