4068
We prospectively evaluated the adverse reactions of apraclonidine in 20 normal volunteers by instilling a single drop of 1 % apraclonidine in their right eyes .
 apraclonidine, apraclonidine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 apraclonidine, apraclonidine