73897
The roots of C5 and C6 form upper trunk ( truncus superior ) , the ramus C7 forms the middle trunk ( truncus medius ) , and the rami C8 and T1 join to form the lower trunk ( truncus inferior ) of the brachial plexus .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None