15778
He is the son of former diplomat Geoffrey Pearson and grandson of the former Canadian  Prime Minister   Lester B. Pearson  .
 title of person: Prime Minister, Lester B. Pearson
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:
 title of person: Prime Minister, Lester B. Pearson