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He then served as an assistant minister at Trinity Church in Boston until 1917 , when he became a Red Cross chaplain at Massachusetts General Hospital .
 location: Boston; organization: Red Cross; organization: Massachusetts General Hospital
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Boston; organization: Red Cross; organization: Massachusetts General Hospital