def extract_named_entity(line):
	"""
	Extract named entity from current line.

	Args:
		line (str): Current line

	Returns:
		str or None: Extracted named entity or None if no named entity is present.
	"""
	try:
		line_parts = line.split("\t")
		feature = line_parts[3]
		if feature != "O":
			return line_parts[2], line_parts[3]
	except IndexError:
		return None