1958
CONCLUSION : The epsilon4 allele in healthy elderly was associated with increased subjective mental slowing after trihexyphenidyl anticholinergic challenge .
 Disease: mental slowing; Chemical: trihexyphenidyl
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:
 Disease: mental slowing; Chemical: trihexyphenidyl