5456
In 1901 he became a member of the Serbian Parliament and played a part in founding the Independent  Radical Party  whose  leader  he became in 1912 .
 Radical Party, leader
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:
 Radical Party, leader