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Melatonin affects the circadian sleep / wake cycle , but it is not clear whether it may influence drug - induced narcosis .
 Chemical: Melatonin; Disease: narcosis
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: Melatonin; Disease: narcosis