1091
Idiopathic subjective tinnitus ( IST ) is one of the most obscure otological pathologies .
 Idiopathic subjective tinnitus, IST
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Idiopathic subjective tinnitus, IST