Refer to the input text as context and select the correct relationship between 'Nintendo' and 'Satoru Iwata' from the available options.
Options: business division, chief executive officer, operator, subsidiary

TOKYO, Sept 14 (Reuters) - Japanese videogame maker Nintendo Co Ltd said on Monday it was promoting Managing Director Tatsumi Kimishima to replace former President Satoru Iwata who died of cancer in July.
chief executive officer