4441
A long - term evaluation of the risk - benefit ratio of tamoxifen as a preventive treatment for breast cancer is clearly warranted .
 Chemical: tamoxifen; Disease: breast cancer
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:
 Chemical: tamoxifen; Disease: breast cancer