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The trials of the chopper manufactured by  Hindustan Aeronautics Limited   Bangalore  were carried out by Commanding Officer of Chandigarh-based Dhruv squadron for over a six-month - period under various weather conditions .
 city of headquarters: Hindustan Aeronautics Limited, Bangalore
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:
 city of headquarters: Hindustan Aeronautics Limited, Bangalore