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The absence of functional C7 activity could not be accounted for on the basis of an inhibitor .
 Disease: absence of functional C7
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
 Entities: absence of functional C7 
Answer:
 Disease: absence of functional C7