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Two key Beshir challengers -- the Umma Party's  Sadiq al-Mahdi  and Yasser Arman of the former rebel  Sudan  People's Liberation Movement ( SPLM ) -- withdrew ahead of the election .
 country of birth: Sadiq al-Mahdi, Sudan
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: 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} 
 Entity Pairs:  Sadiq al-Mahdi, Sudan 
Answer:
 country of birth: Sadiq al-Mahdi, Sudan