Utilize the input text as a context reference, choose the right relationship between 'Nintendo' and 'Tatsumi Kimishima' from the options.
Options: parent organization, chief executive officer, developer, 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