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It's our pleasure to announce that our two formations in parliament have agreed to work together said Morgan Tsvangirai leader of the  Movement for Democratic Change  speaking alongside  Arthur Mutambara  head of a faction of the MDC at a joint press conference in Johannesburg .
 Movement for Democratic Change, Arthur Mutambara
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 Movement for Democratic Change, Arthur Mutambara