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 besmetting was in BelgiÃƒÆ’Ã‚Â« .
Example Output: None

Example Input: Vorig jaar woonden 220.000 bezoekers het festival bij .
Example Output: None

Example Input: Wat dat laatste betreft , werden dit keer zoals bekend geen afspraken met de NMBS gemaakt over zogeheten ' ozonbiljetten ' .
Example Output:
None