Take context from the input text and decide on the accurate relationship between 'Volker Kauder' and 'chief whip' from the options provided.
Options: stock exchange, parent organization, position held, creator

Underlining the stakes involved, the party's chief whip Volker Kauder this month vowed to impose sanctions on any dissidents in his ranks -- a threat that may have backfired by antagonising backbenchers.
position held