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figure out why people so M etimes called my mother Doctor. The doctor was the guy with the excessive white nose hairs who put the cold stethoscope on my back once a year and Dr ew a Pac-Man around the pinpricks of my tuberculin test. My mom was not a doctor. She worked at a desk. But I heard her introduce herself as Doctor Ruben a few times. And sometimes the mail would arrive addressed to Mr. and Dr. Ruben. What was going on? Was my mother leading a double life?
 education institution: M, Dr
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: M, Dr