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Symptoms relief in the group receiving the highest concentration of azelastine ( 2 . 0 mg twice daily ) was statistically greater than in the placebo group during all weeks of the study .
 Chemical: azelastine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: azelastine