code: def read_gold_standard_file(data_dir, fileroot, encoding=None, cetr=False):
      
      fname = os.path.join(
          data_dir, GOLD_STANDARD_DIRNAME, fileroot + GOLD_STANDARD_EXT)
      encodings = (encoding,) if encoding else ('utf-8', 'utf-16', 'iso-8859-1')
      for encoding in encodings:
          try:
              with io.open(fname, mode='rt', encoding=encoding) as f:
                  gold_standard = f.read()
              break
          except (UnicodeDecodeError, UnicodeError):
              gold_standard = None
  
      if not gold_standard:
          return [u'', u'']
  
      if not cetr:
          content_comments = RE_COMMENTS_DELIM.split(gold_standard, maxsplit=1)
          # if no comments delimiter found, append empty comments string
          if len(content_comments) == 1:
              content_comments = [content_comments[0], u'']
      else:
          tree = etree.fromstring(gold_standard, parser=etree.HTMLParser())
          content_comments = [u' '.join(text_from_subtree(tree)), u'']
  
      # fix text in case of mangled encodings
      content_comments = [ftfy.fix_encoding(content_comments[0]).strip(),
                          ftfy.fix_encoding(content_comments[1]).strip()]
  
      return content_comments
docs: Read the gold standard content file corresponding to identifier ``fileroot``
      in the gold standard directory below the root ``data_dir``.
  
      Args:
          data_dir (str)
          fileroot (str)
          encoding (str)
          cetr (bool): if True, assume no comments and parse the gold standard
              to remove tags
  
      Returns:
          List[str, str]: contents string and comments string, respectively