1092
This paper presents the results of treating IST by intratympanic instillation of lignocaine ( lidocaine ) 2 per cent through a grommet , for five weekly courses .
 IST, lignocaine, lidocaine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 IST, lignocaine, lidocaine