def highest_centrality(cent_dict):
    """ Extract the highest central node.

    Parameters
    ----------
    cent_dict: dict
        the centrality measures for each node.

    Returns
    -------
    high_cent: 2-uplet
        a tuple (node, value) with the node with largest value.
    """
    cent_items = [(b, a) for (a, b) in cent_dict.items()]
    cent_items.sort()
    cent_items.reverse()
    return tuple(reversed(cent_items[0]))