2315
On the other hand , knowledge of the epidemiology of Parkinson ' s disease is necessary in creating etiological hypotheses , since only hypotheses consistent with the epidemiological profile deserve careful testing .
 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