2998
Thirty - six rats bearing breast tumors induced chemically were divided into 4 groups : control , hydroxytyrosol ( 0 . 5mg / kg , 5days / week ) , doxorubicin ( 1mg / kg / week ) , and doxorubicin plus hydroxytyrosol .
 Disease: breast tumors; Chemical: hydroxytyrosol; Chemical: doxorubicin; Chemical: doxorubicin; Chemical: hydroxytyrosol
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:
 Disease: breast tumors; Chemical: hydroxytyrosol; Chemical: doxorubicin; Chemical: doxorubicin; Chemical: hydroxytyrosol