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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def convert_option_dict_to_dict(option_dict):
 """Convert a dictionary of options tuples to a simple key-value dictionary"""

    ret_dict = {}
    for key, value in option_dict.items():
        if is_null(value):
            ret_dict[key] = None
        elif isinstance(value, tuple):
            ret_dict[key] = value[0]
        else:
            ret_dict[key] = value
    return ret_dict