25703
Participants received cetirizine 15 mg ( an antihistamine ) , verapamil 120 mg ( a P - gp blocker ) , a combination of cetirizine + verapamil , and a placebo .
 Chemical: cetirizine; Chemical: verapamil; Chemical: cetirizine; Chemical: verapamil
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: cetirizine, verapamil, cetirizine, verapamil 
Answer:
 Chemical: cetirizine; Chemical: verapamil; Chemical: cetirizine; Chemical: verapamil