1930
Two or three BZDs / RDs were concomitantly taken by 26 % of users ( n = 20 ) .
 Chemical: BZDs
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: BZDs 
Answer:
 Chemical: BZDs