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Ahead of the visit Egyptian security forces have rounded up hundreds of students at  Cairo  's  Al-Azhar University  an ancient hub of Islamic scholarship that is co-hosting Obama's visit .
 city of headquarters: Cairo, Al-Azhar University
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: Cairo, Al-Azhar University