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: Dat bedrijf is ontstaan uit de fusie van Siebe en BTR .
Example Output: None

Example Input: Nederland wereldkampioen . "
Example Output: None

Example Input: Waarom koos u voor Concentra ?
Example Output:
None