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: Ze hebben deze monstervorming in het Nederlands toch niet betaald ?
Example Output: None

Example Input: Parijs
Example Output: None

Example Input: Dus allen naar de huidarts ?
Example Output:
None