def find_gene_name(qualifiers):
    """Finds a gene name in a dictionary of feature qualifiers."""
    if not isinstance(qualifiers, dict):
        raise TypeError("Expected qualifier dictionary")
    for tag in ["locus_tag", "protein_id", "id", "gene", "name", "label"]:
        if tag in qualifiers:
            return qualifiers[tag][0]
    return "N.A."