What is the relationship between MTN Nigeria and MTN Group in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

MTN Nigeria subscriber base increases but revenues drop MTN Group CEO , By MTHULISI SIBANDA JOHANNESBURG, (CAJ News ) – THE MTN Group has announced a decline in revenues at its Nigerian entity during the first half of the year.

Answer: parent_organization