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Mercury induces the expression of cyclooxygenase - 2 and inducible nitric oxide synthase .
 Chemical: Mercury; Chemical: nitric oxide
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: Mercury, nitric oxide 
Answer:
 Chemical: Mercury; Chemical: nitric oxide