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The addition of ephedrine to propofol appears to be an effective method of obtunding the hypotensive response to propofol at all doses used in this study .
 Chemical: ephedrine; Chemical: propofol; Disease: hypotensive; Chemical: propofol
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: ephedrine, propofol, hypotensive, propofol 
Answer:
 Chemical: ephedrine; Chemical: propofol; Disease: hypotensive; Chemical: propofol