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: Op jaarbasis verbruiken de Spoorwegen 1,4 miljard kilowattuur , wat hen ÃƒÆ’Ã‚Â©ÃƒÆ’Ã‚Â©n van de grootste klanten van Electrabel maakt .
Example Output: None

Example Input: Petersen ( Den ) -- 6 .
Example Output: Petersen: B-PER

Example Input: Alle andere motoren , ook de bij ons heel populaire diesels , blijven ongewijzigd .
Example Output:
None