201776
Plot Macedonia opens with Heather Roberson , a student of Peace and Conflict Studies at the University of California at Berkeley , arguing with a professor about the inevitability of war .
 Macedonia, University of California at Berkeley
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Macedonia, University of California at Berkeley