1039
Bolton  born  Amir Khan  became the WBA World light-welterweight champion on 18 July 2009 at the age of 22 making him Britain's third-youngest world champion boxer .
 alternate names: Bolton, Amir Khan
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "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} 
Answer:
 alternate names: Bolton, Amir Khan