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Democratic governments in the Middle East are going to be much more difficult for the United States to handle because there will be more direct expression of sentiment , much of it hostile , '' said Rashid Khalidi , a professor of Middle Eastern studies at Columbia University . ''
 Rashid Khalidi, Columbia University
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
Answer:
 Rashid Khalidi, Columbia University