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the study found that people who took the combination of cholinesterase inhibitors ( aricept , razadyne , or exelon ) and memantine , showed a significantly slower rate of cognitve decline than those who took only a cholinesterase inhibitor or no drug .
 None
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: component whole, NA, instrument agency, member collection, cause effect, entity destination, content container, message topic, product producer, entity origin 
Text: {0} 
 Entity Pairs:   
Answer:
 NA: combination, inhibitors