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: Joker :
Example Output: None

Example Input: Branko Strupar weet zaterdag alle ogen op hem gericht
Example Output: Branko: B-PER, Strupar: I-PER

Example Input: Deze middelen vertragen de veroudering van de huid , maar of ze ook melanomen voorkomen , is niet vanzelfsprekend .
Example Output:
None