4182
During the last 6 months of the study a striking change in epidemiology concerning hepatitis A was seen , apparently caused by a steep increase in the incidence of this type of hepatitis among drug addicts .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities:  
Answer:
 None