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: Wie is zijn favoriet ?
Example Output: None

Example Input: De Zuidkant praat met Jan Wauters over de keeper , zijn favoriete speler .
Example Output: Jan: B-PER, Wauters: I-PER

Example Input: SBS zal dan ook meegaan in het verhaal van de digitale paketten .
Example Output:
None