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There has been a steep increase in the prevalence of dementia in recent decades , which has roughly followed an increase in pesticide use some decades earlier , a time when it is probable that current dementia patients could have been exposed to pesticides .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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