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: Hij werkte ooit nog op het kabinet van oud-premier Jean-Luc Dehaene en is nauw bevriend met Vlaams VLD-minister Dirk Van Mechelen .
Example Output: Jean-Luc: B-PER, Dehaene: I-PER, Dirk: B-PER, Van: I-PER, Mechelen: I-PER

Example Input: Elektriciteit
Example Output: None

Example Input: Flupke .
Example Output:
Flupke: B-PER