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Therefore , we examined whether the PDE5 - I vardenafil improves memory and executive functioning and affect electroencephalography ( EEG ) in healthy young adults .
 Chemical: vardenafil
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: vardenafil