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 leerkrachten die zich sedert het begin van de jaren negentig vrijwillig inzetten voor de ontwikkeling van informatica op school , dreigen nu te stoppen .
Example Output: None

Example Input: Advies
Example Output: None

Example Input: " Nederlanders zijn verslingerd aan Grote Voetbalmomenten .
Example Output:
None