1866
Calyampudi Radhakrishna Rao  FRS known as C R Rao ( born 10 September 1920 ) is an Indian  American  mathematician and statistician .
 origin: Calyampudi Radhakrishna Rao, American
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:  Calyampudi Radhakrishna Rao, American 
Answer:
 origin: Calyampudi Radhakrishna Rao, American