1643
Moreover , both hepatitis B surface antigen and e antigen were observed to have disappeared in this patient .
 Chemical: hepatitis B surface antigen and e antigen
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: hepatitis B surface antigen and e antigen 
Answer:
 Chemical: hepatitis B surface antigen and e antigen