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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 _parse_content_type(content_type: Optional[str]) -> Tuple[Optional[str], str]: """Tease out the content-type and character encoding. A default character encoding of UTF-8 is used, so the content-type must be used to determine if any decoding is necessary to begin with. """

    if not content_type:
        return None, "utf-8"
    else:
        type_, parameters = cgi.parse_header(content_type)
        encoding = parameters.get("charset", "utf-8")
        return type_, encoding