
    Given a collection of patient activity records where each record contains an activity type and its associated stability score, identify the activity that has the lowest stability score, indicating the highest fall risk. The stability score is a numerical value where lower scores represent greater instability, and the function should return the corresponding activity type for the lowest stability score found.
    

    
from operator import itemgetter

def index_minimum(test_list):
    """
    Given a collection of patient activity records where each record contains an activity type and its associated stability score, identify the activity that has the lowest stability score, indicating the highest fall risk. The stability score is a numerical value where lower scores represent greater instability, and the function should return the corresponding activity type for the lowest stability score found.
    

    """
from operator import itemgetter

def index_minimum(test_list):
    """
    Given a collection of patient activity records where each record contains an activity type and its associated stability score, identify the activity that has the lowest stability score, indicating the highest fall risk. The stability score is a numerical value where lower scores represent greater instability, and the function should return the corresponding activity type for the lowest stability score found.
    

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