In this task, you will be presented with a question in Dutch language, and you have to write the person names from the question if present. B denotes the first item of a phrase and an I any non-initial word. Phrase used for the person name - PER. There can be instances with no person name entity, then return 'None'.

Example Input: De zin van zon
Example Output: None

Example Input: De maatschappij bezat toen al 39 procent van Tractebel .
Example Output: None

Example Input: Een Oued is immers een droge rivierbedding en deze laat zich niet vooraf in kaart brengen .
Example Output:
None