26782
METHODS : Primary cortical astrocytes and C8 - D1A cells were exposed to different concentrations of zinc chloride .
 Chemical: zinc chloride
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: zinc chloride 
Answer:
 Chemical: zinc chloride