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Furthermore , the predominant pulmonary effect caused by GaAs ( but not by nickel subsulphide ) is alveolar proteinosis .
 Chemical: GaAs; Chemical: nickel subsulphide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: GaAs; Chemical: nickel subsulphide