26722
Besides smoking , hypertension , obesity , and certain dietary habits , a growing body of evidence indicates that inflammation and the immune system may play a key role in the development of the disease .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None