17617
Pretreatment with gallein produced a dose - dependent potentiation of morphine - mediated antinociception , producing up to a 10 - fold leftward shift in the morphine dose - response curve and extending the duration of antinociception induced by a single dose of morphine .
 Chemical: gallein; Chemical: morphine; Chemical: morphine; Chemical: morphine
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: gallein, morphine, morphine, morphine 
Answer:
 Chemical: gallein; Chemical: morphine; Chemical: morphine; Chemical: morphine