6588
Recently , we demonstrated that , in neurones , Ngb is a 17 beta - oestradiol ( E ( 2 ) ) inducible protein that is pivotal for hormone - induced anti - apoptotic effects against H ( 2 ) O ( 2 ) toxicity .
 Chemical: 17 beta - oestradiol; Chemical: H ( 2 ) O ( 2 )
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: 17 beta - oestradiol, H ( 2 ) O ( 2 ) 
Answer:
 Chemical: 17 beta - oestradiol; Chemical: H ( 2 ) O ( 2 )