12756
Benzophenone - 1 stimulated the growth of BG - 1 ovarian cancer cells by cell cycle regulation via an estrogen receptor alpha - mediated signaling pathway in cellular and xenograft mouse models .
 Chemical: Benzophenone - 1; Chemical: estrogen
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: Benzophenone - 1, estrogen 
Answer:
 Chemical: Benzophenone - 1; Chemical: estrogen