2722
To characterize the nature , time course and dose dependency of zidovudine - related side effects , we undertook a multicenter , prospective , dose - range finding study .
 Chemical: zidovudine
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: zidovudine 
Answer:
 Chemical: zidovudine