4280
BACKGROUND : Increased attention has been focused recently on the estrogenic effects of tamoxifen .
 Chemical: tamoxifen
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: tamoxifen 
Answer:
 Chemical: tamoxifen