
    In a batch of student essays, each identified by a unique ID and paired with its automated readability score, find the ID of the most readable essay. The readability scores are calculated using a standardized metric where lower values indicate better readability. Return the essay ID that corresponds to the lowest readability score in the dataset.
    

    
from operator import itemgetter

def index_minimum(test_list):
    """
    In a batch of student essays, each identified by a unique ID and paired with its automated readability score, find the ID of the most readable essay. The readability scores are calculated using a standardized metric where lower values indicate better readability. Return the essay ID that corresponds to the lowest readability score in the dataset.
    

    """
from operator import itemgetter

def index_minimum(test_list):
    """
    In a batch of student essays, each identified by a unique ID and paired with its automated readability score, find the ID of the most readable essay. The readability scores are calculated using a standardized metric where lower values indicate better readability. Return the essay ID that corresponds to the lowest readability score in the dataset.
    

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