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As an undergraduate David Henige attended the University of Wisconsin of Toledo, Ohio in the 1960s, obtaining first a B.A. then a Master's degree in history. In 1967 he enrolled for postgraduate studies at UW-- Madison, completing a PhD in African History in 1973. Fieldwork towards his degree was undertaken in Ghana, West Africa. Henige's long association with the Memorial Library began during his PhD studies, where part of his time was spent working for the library.
 education institution: David Henige, University of Wisconsin
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: place of death, place of birth, education degree, education institution 
Text: {0} 
Answer:
 education institution: David Henige, University of Wisconsin